Cross-Reference to Related Application

[0001] This application claims the benefit of U.S. Provisional Application No.: 62/601,855, filed 06/15/2017, which is hereby incorporated by reference in its entirety.

Field of the Present Disclosure

[0002] The present disclosure generally relates to firearms and more specifically to firearm components for short carbine rifles.

Background of the Present Disclosure

[0003] Many rifles have a front sight mounted at the front end of a handguard or forend. Many rifles have a front sight mounted to a gas block or gas chamber. Front sights mounted rearward from the end of a barrel decrease the potential sight radius. The effective length of a barrel may be changed by adding components such as flash hiders, compensators, muzzle breaks, and suppressors. Existing front sights may not be able to adapt to changes in effective barrel length for improved sight radius. What is needed is an improved front sight assembly.

[0004] Many rifles are not adapted to receive a bayonet. Many rifles are not adapted to receive a bayonet quickly and easily. Many rifles are only adapted to receive a specific bayonet or a specific bayonet type. What is needed is an improved bayonet mount for mounting a plurality of bayonets of more than one bayonet type to a rifle.

[0005] Many semi-automatic and/or automatic rifles have a gas tube. Many semi-automatic and/or automatic rifles have a handguard or forend separate from the gas tube. In many cases, a separate gas tube may add additional weight and/or complexity. What is needed is an improved handguard or forend.

Summary of the Present Disclosure

[0006] At least some embodiments of the present disclosure provide a front sight assembly for a firearm. The firearm has a rear sight. The front sight assembly comprises a mount. The mount is adapted to connect to the firearm. The front sight assembly comprises a first elongated bar. The first elongated bar has a rear end adapted to removably connect to the mount. The first elongated bar has a front end opposite the rear end. The front sight assembly comprises a front sight adapted to removably connect to the first elongated bar. The first elongated bar has a first length establishing a first sight radius between the rear sight and the front sight. [0007] The mount may be further adapted to removably connect to a second elongated bar having a second length different from the first length, such that a second sight radius different from the first sight radius is provided.

[0008] The front sight may be further adapted to removably connect to the second elongated bar having the second length different from the first length, such that the second sight radius different from the first sight radius is provided.

[0009] The front sight may be further adapted to removably connect to the second elongated bar.

[0010] A plurality of different length elongated bars may each be adapted to removably

connect to the mount and to the front sight.

[0011] The front sight may be positioned forward of the mount by a distance based on the first length.

[0012] The front sight may be positioned forward of the mount by a distance based on the second length.

[0013] The front sight may be positioned forward of the mount by a plurality of distances each based on a length of one of the plurality of different length elongated bars.

[0014] The mount may define a first bore adapted to securely receive a barrel. The mount may define a second bore adapted to securely receive the first elongated bar.

[0015] The second bore may be further adapted to securely receive the second elongated bar.

[0016] The second bore may be further adapted to securely receive any of the plurality of different length elongated bars.

[0017] The second bore may be parallel to the first bore.

[0018] The second bore may include an internal shoulder adapted to limit insertion of the first elongated bar.

[0019] The second bore may include an internal shoulder adapted to limit insertion of the second elongated bar.

[0020] The second bore may include an internal shoulder adapted to limit insertion of any of the plurality of different length elongated bars.

[0021] The first elongated bar may be a cylindrical rod.

[0022] The second elongated bar may be a cylindrical rod.

[0023] Each of the plurality of different length elongated bars may be a cylindrical rod.

[0024] The mount may comprises a first block mating feature. The front sight assembly may further comprise a first adapter plate. The first adapter plate may have a first adapter mating feature adapted to removably connect to the first block mating feature. The first adapter plate may have a first catch with a first catch surface adapted for selectable engagement by a first latch of a pommel of a first bayonet.

[0025] At least some embodiments of the present disclosure provide a bayonet mount for a rifle and a first bayonet. The first bayonet has a pommel with a first latch. The first bayonet has a first crossguard defining a first mounting ring bore of a first bore diameter. The bayonet mount comprises a mounting block adapted to securely connect to the rifle. The mounting block has a first block mating feature. The bayonet mount comprises a first adapter plate having a first adapter mating feature adapted to removably connect to the first block mating feature. The first adapter plate has a first catch with a first catch surface adapted for selectable engagement by the first latch. The bayonet mount comprises a bayonet stop connected to a barrel of the rifle. The bayonet stop has a first cylindrical portion forward of a first shoulder, the first cylindrical portion having a first diameter sized to be closely received in the first mounting ring bore, and the first shoulder being aft of the first cylindrical portion and adapted to abut a first rear surface of the first crossguard to position the first latch in alignment with the first catch.

[0026] The bayonet stop may further include a second cylindrical portion adjacent to the first cylindrical portion. The second cylindrical portion may have a second diameter different than the first diameter, such that a second bayonet having a second mounting ring bore of a second bore diameter may be closely received.

[0027] The first cylindrical portion may be adjacent to the second cylindrical portion.

[0028] The smaller of the first cylindrical portion and the second cylindrical portion may be forward of the larger of the first cylindrical portion and the second cylindrical portion.

[0029] The bayonet mount may further include a second shoulder defined by a forward

portion of the first cylindrical portion.

[0030] The second shoulder may be aft of the second cylindrical portion.

[0031] The bayonet mount may further include a second adapter plate having the first adapter mating feature adapted to removably connect to the first block mating feature. The second adapter plate may have a second catch with a second catch surface adapted for selectable engagement by a second latch associated with a second bayonet different from the first bayonet.

[0032] The first bayonet may have a first mounting length between the first latch and the rear of the first rear surface of the first crossguard. The first catch of the first adapter plate may be positioned aft of the first shoulder by the first mounting length. [0033] The second bayonet may have a second mounting length between a second latch and the rear of a second rear surface of a second crossguard. A second catch of a second adapter plate may be positioned aft of a second shoulder by the second mounting length.

[0034] The first catch may be on an aft portion of the first adapter plate.

[0035] The second catch may be on a forward portion of the second adapter plate.

[0036] The bayonet mount may further include the first elongated bar having a rear end

adapted to removably connect to the mounting block. The first elongated bar may have a front end opposite the rear end. The bayonet mount may further include the front sight adapted to removably connect to the first elongated bar. The first elongated bar may have a first length establishing a first sight radius between a rear sight of the rifle and the front sight.

[0037] At least some embodiments of the present disclosure provide a bayonet stop adapted for supporting at least two different bayonets. Each of the at least two different bayonets has a different ring bore diameter. The bayonet stop comprises a body. The body is adapted to connect to a rifle barrel. The body has a first shoulder portion. The first shoulder portion has a forward- facing first shoulder surface. The body has a first cylindrical portion. The first cylindrical portion is forward of the forward-facing first shoulder surface. The first cylindrical portion has a first diameter. The first cylindrical portion has a forward-facing second shoulder surface. The body has a second cylindrical portion. The second cylindrical portion is forward of the forward-facing second shoulder surface. The second cylindrical portion has a second diameter. The second diameter is less than the first diameter.

[0038] The first cylindrical portion may be adapted to closely receive a first ring bore of a first bayonet.

[0039] The second cylindrical portion may be adapted to closely receive a second ring bore of a second bayonet different from the first bayonet.

[0040] The bayonet stop may include a mounting block connected to the rifle barrel and

adapted to removably receive a plurality of adapter plates each associated with a respective one of a plurality of bayonets, the plurality of bayonets including the first bayonet.

[0041] The bayonet stop may include a mounting block connected to the rifle barrel and

adapted to removably receive a plurality of adapter plates each associated with a respective one of a plurality of bayonets, the plurality of bayonets including the first bayonet and the second bayonet.

[0042] The bayonet stop may include a flash hider. The body may be adapted to removably receive the flash hider. [0043] At least some embodiments of the present disclosure provide a rifle. The rifle comprises a frame. The rifle comprises a barrel connected to the frame. The rifle comprises a bolt aligned with the barrel operable to reciprocate in the frame. The rifle comprises a gas block connected to the barrel and defining a gas passage in communication with the barrel. The rifle comprises an elongated forearm defining a barrel passage receiving the barrel. The elongated forearm defines an elongated cylindrical passage above the barrel passage. The elongated cylindrical passage has a forward end in communication with the gas passage. The elongated cylindrical passage has a rear end. The elongated cylindrical passage has an enclosed intermediate portion extending between the forward end and the rear end. The rifle comprises an operating rod having a rear end adapted to motivate the bolt and having a forward free end with a cylinder head closely received in the enclosed intermediate portion of the elongated cylindrical passage.

[0044] The elongated forearm may be a single integral element.

[0045] The elongated forearm may include a single integral element defining the elongated cylindrical passage.

[0046] The elongated forearm may define external rail mounting structures.

[0047] The elongated forearm may have a containment wall having an interior surface

defining the enclosed intermediate portion of the elongated cylindrical passage and an external surface exposed to atmosphere for heat dissipation.

[0048] The elongated forearm may be formed of aluminum.

[0049] At least some embodiments of the present disclosure provide a handguard for a gas piston operated rifle. The handguard comprises an elongated body defining an elongated barrel passage. The elongated body defines a gas passage having a forward opening adapted to receive gas pressure from a gas block, and a rear opening opposed to the forward opening. The gas passage is enclosed except at the forward opening and the rear opening.

[0050] A cylinder head may be closely received in the gas passage. An operating rod may extend rearward from the cylinder head.

[0051] The operating rod may extend from the rear opening.

[0052] The gas passage may be parallel to the elongated barrel passage.

[0053] The gas passage may be above the elongated barrel passage.

[0054] The elongated body may be a single integral element defining the gas passage.

[0055] The elongated body may be formed of aluminum.

[0056] The gas passage may be a straight cylindrical bore.

[0057] The gas passage may be seamless along its length.

[0058] The elongated body may define an external rail mount. Brief Description of the Drawings

[0059] FIG. 1 illustrates an example front sight assembly installed on an example firearm according to various aspects of an embodiment.

[0060] FIG. 2 illustrates an example front sight assembly installed on an example firearm according to various aspects of an embodiment.

[0061] FIG. 3 illustrates a cross-sectional view of an example front sight assembly installed on an example firearm according to various aspects of an embodiment.

[0062] FIG. 4A and FIG. 4B illustrate cross-sectional views of an example front sight

assembly mounted to an example barrel of an example firearm according to various aspects of an embodiment.

[0063] FIG. 5A and FIG. 5B illustrate cross-sectional views of an example front sight

assembly mounted to an example barrel of an example firearm according to various aspects of an embodiment.

[0064] FIG. 6A and FIG. 6B illustrate an example front sight assembly according to various aspects of an embodiment.

[0065] FIG. 7 illustrates an exploded view of an example front sight assembly according to an aspect of an embodiment.

[0066] FIG. 8A and FIG. 8B illustrate an example bayonet mount connected to an example barrel of an example firearm and example bayonets according to various aspects of an embodiment.

[0067] FIG. 9A and FIG. 9B illustrate cross-sectional views of an example bayonet mount connected to an example barrel of an example firearm and example bayonets according to various aspects of an embodiment.

[0068] FIG. 10A and FIG. 10B illustrate cross-sectional views of an example bayonet mount connected to an example barrel of an example firearm and example bayonets according to various aspects of an embodiment.

[0069] FIG. 11 A and FIG. 1 IB illustrate an example bayonet mount connected to an example barrel of an example firearm and a first bayonet according to various aspects of an embodiment.

[0070] FIG. 12A and FIG. 12B illustrate an example bayonet mount connected to an example barrel of an example firearm and a second bayonet according to various aspects of an embodiment.

[0071] FIG. 13A and FIG. 13B illustrate an example bayonet mount connected to an example barrel of an example firearm according to various aspects of an embodiment. [0072] FIG. 14A and FIG. 14B illustrate an example bayonet mount with a first adapter plate connected to an example barrel of an example firearm according to various aspects of an embodiment.

[0073] FIG. 15A and FIG. 15B illustrate an example bayonet mount with a second adapter plate connected to an example barrel of an example firearm according to various aspects of an embodiment.

[0074] FIG. 16 illustrates an example mounting block, first adapter plate, and second adapter plate according to an aspect of an embodiment.

[0075] FIG. 17 illustrates an example mounting block, first adapter plate, and second adapter plate according to an aspect of an embodiment.

[0076] FIG. 18 illustrates an example front sight assembly with an example adapter plate installed on an example firearm according to various aspects of an embodiment.

[0077] FIG. 19 illustrates an example front sight assembly with an example adapter plate installed on an example firearm according to various aspects of an embodiment.

[0078] FIG. 20 illustrates an example bayonet mount with a front sight connected to an

example barrel of an example firearm and an example bayonet according to various aspects of an embodiment.

[0079] FIG. 21 illustrates an example bayonet mount with a front sight connected to an

example barrel of an example firearm and an example bayonet according to various aspects of an embodiment.

[0080] FIG. 22 illustrates an example elongated forearm connected to an example frame of an example rifle with an example barrel according to various aspects of an embodiment.

[0081] FIG. 23 illustrates an example elongated forearm connected to an example frame of an example rifle with an example barrel according to various aspects of an embodiment.

[0082] FIG. 24A and FIG. 24B illustrate cross-sectional views of example handguards for an example gas piston operated rifle according to various aspects of an embodiment.

[0083] FIG. 25A and FIG. 25B illustrate example handguards for a gas piston operated rifle according to various aspects of an embodiment.

[0084] FIG. 26A and FIG. 26B illustrate example handguards for a gas piston operated rifle according to various aspects of an embodiment.

[0085] FIG. 27 illustrates an example lower portion of an example two-piece handguard according to an aspect of an embodiment.

[0086] FIG. 28A illustrates a rear view of an example lower portion of an example two-piece handguard according to an aspect of an embodiment. [0087] FIG. 28B illustrates a front view of an example lower portion of an example two-piece handguard according to an aspect of an embodiment.

[0088] FIG. 29 illustrates an example upper portion of an example two-piece handguard

according to an aspect of an embodiment.

[0089] FIG. 30A illustrates a rear view of an example upper portion of an example two-piece handguard according to an aspect of an embodiment.

[0090] FIG. 30B illustrates a front view of an example upper portion of an example two-piece handguard according to an aspect of an embodiment.

Detailed Description of the Current Embodiments

[0091] Embodiments of the present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. This present disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure. Like numbers refer to like elements throughout.

[0092] Certain embodiments of the present disclosure provide a front sight assembly.

[0093] Certain embodiments of the present disclosure provide a bayonet mount.

[0094] Certain embodiments of the present disclosure provide a bayonet stop.

[0095] Certain embodiments of the present disclosure provide a rifle.

[0096] Certain embodiments of the present disclosure provide a handguard for a gas piston operated rifle.

[0097] FIG. 1 illustrates an example front sight assembly installed on an example firearm 2 according to various aspects of an embodiment. The firearm 2 may comprise a rifle, a short carbine rifle, a shotgun, and/or the like. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The barrel 6 may be adapted to receive a suppressor 40. The barrel 6 may be fluted. The front sight assembly may comprise a mount 10. The mount 10 may be adapted to connect to the firearm 2. The front sight assembly may comprise a first elongated bar 14. The first elongated bar 14 may comprise a rear end adapted to removably connect to the mount 10. The first elongated bar 14 may comprise a front end opposite the rear end. The first elongated bar 14 may be a cylindrical rod. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the first elongated bar 14. The front end of the first elongated bar 14 may be adapted to removably connect to the front sight 12. The first elongated bar 14 may comprise a first length. The first length may establish a first sight radius between the rear sight 4 and the front sight 12. The front sight 12 may be positioned forward of the mount 10 by a distance based on the first length.

[0098] According to an embodiment, a front sight (for example, 12) may comprise at least a partial hood. The at least a partial hood may comprise at least one side cut. The at least one side cut may be configured to allow more light to penetrate the interior of the at least a partial hood.

[0099] FIG. 2 illustrates an example front sight assembly installed on an example firearm 2 according to various aspects of an embodiment. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The front sight assembly may comprise a mount 10. The front sight assembly may comprise a second elongated bar 16. The second elongated bar 16 may comprise a rear end adapted to removably connect to the mount 10. The mount 10 may be adapted to removably connect to the second elongated bar 16 having a second length different from a first length. The second elongated bar 16 may comprise a front end opposite the rear end. The second elongated bar 16 may be a cylindrical rod. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the second elongated bar 16. The front end of the second elongated bar 16 may be adapted to removably connect to the front sight 12. The second elongated bar 16 may comprise the second length. The second length may establish a second sight radius between the rear sight 4 and the front sight 12. The second sight radius may be different from a first sight radius. The front sight 12 may be positioned forward of the mount 10 by a distance based on the second length.

[0100] FIG. 3 illustrates a cross-sectional view of an example front sight assembly installed on an example firearm 2 according to various aspects of an embodiment. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The front sight assembly may comprise a mount 10. The front sight assembly may comprise a second elongated bar 16. The front sight assembly may comprise a front sight 12.

[0101] FIG. 4A and FIG. 4B illustrate cross-sectional views of an example front sight

assembly mounted to an example barrel 6 of an example firearm according to various aspects of an embodiment. The front sight assembly may comprise a mount 10. The mount 10 may be adapted to connect to the barrel 6. The front sight assembly may comprise a first elongated bar 14. The first elongated bar 14 may comprise a rear end adapted to removably connect to the mount 10. The first elongated bar 14 may comprise a front end opposite the rear end. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the first elongated bar 14. The front end of the first elongated bar 14 may be adapted to removably connect to the front sight 12. The barrel 6 may be adapted to receive a flash hider 30. The flash hider 30 may be adapted to receive a suppressor 40. The mount 10 may define a first bore adapted to securely receive the barrel 6. The mount 10 may define a second bore adapted to securely receive the first elongated bar 14. The second bore may be parallel to the first bore. The second bore may include an internal shoulder 20 adapted to limit insertion of the first elongated bar 14. The front sight 12 may define a third bore adapted to securely receive the first elongated bar 14. The third bore may include an internal shoulder 22 adapted to limit insertion of the first elongated bar 14.

[0102] FIG. 5 A and FIG. 5B illustrate cross-sectional views of an example front sight

assembly mounted to an example barrel 6 of an example firearm according to various aspects of an embodiment. The front sight assembly may comprise a mount 10. The mount 10 may be adapted to connect to the barrel 6. The front sight assembly may comprise a second elongated bar 16. The second elongated bar 16 may comprise a rear end adapted to removably connect to the mount 10. The second elongated bar 16 may comprise a front end opposite the rear end. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the second elongated bar 16. The front end of the second elongated bar 16 may be adapted to removably connect to the front sight 12. The barrel 6 may be adapted to receive a flash hider 30. The mount 10 may define a first bore adapted to securely receive the barrel 6. The mount 10 may define a second bore adapted to securely receive the second elongated bar 16. The second bore may be parallel to the first bore. The second bore may include an internal shoulder 20 adapted to limit insertion of the second elongated bar 16. The front sight 12 may define a third bore adapted to securely receive the second elongated bar 16. The third bore may include an internal shoulder 22 adapted to limit insertion of the second elongated bar 16.

[0103] According to an embodiment, a front sight assembly may comprise a plurality of

different length elongated bars (for example, 14 and 16), each adapted to removably connect to a mount (for example, 10) and to a front sight (for example, 12). Each of the plurality of different length elongated bars may be a cylindrical rod. The front sight may be positioned forward of the mount by a plurality of distances each based on a length of one of the plurality of different length elongated bars. The mount may define a first bore adapted to securely receive a barrel (for example, 6). The mount may define a second bore adapted to securely receive any of the plurality of different length elongated bars. The second bore may be parallel to the first bore. The second bore may include an internal shoulder (for example, 20) adapted to limit insertion of any of the plurality of different length elongated bars. The front sight may define a third bore adapted to securely receive any of the plurality of different length elongated bars. The third bore may include an internal shoulder (for example, 22) adapted to limit insertion of any of the plurality of different length elongated bars.

[0104] FIG. 6A and FIG. 6B illustrate an example front sight assembly according to various aspects of an embodiment. The front sight assembly may comprise a mount 10. The mount 10 may define a first bore 50 adapted to securely receive a barrel. The mount may be configured to receive mount bolts 60. The front sight assembly may comprise a second elongated bar 16. The second elongated bar 16 may comprise a rear end adapted to removably connect to the mount 10. The mount 10 may define a second bore 52 adapted to securely receive the second elongated bar 16. The second bore 52 may be parallel to the first bore 50. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the second elongated bar 16. The second elongated bar 16 may comprise a front end opposite the rear end. The front end of the second elongated bar 16 may be adapted to removably connect to the front sight 12. The second elongated bar 16 may comprise a slot. The slot may be adapted to receive a mount pin 66 and/or a front sight pin 68. The mount pin 66 may be employed to reduce the potential for rotation of the second elongated bar 16 within the mount 10. The front sight pin 68 may be employed to reduce the potential for rotation of the second elongated bar 16 within the front sight 12. The second elongated bar 16 may be adapted to threadably receive a mount fastener 62. The mount fastener 62 may be employed to secure the second elongated bar 16 to the mount 10. The second elongated bar 16 may be adapted to threadably receive a front sight fastener 64. The front sight fastener 64 may be employed to secure the second elongated bar 16 to the front sight 12.

[0105] FIG. 7 illustrates an exploded view of an example front sight assembly according to an aspect of an embodiment. The front sight assembly may comprise a mount 10. The mount 10 may define a first bore 50 adapted to securely receive a barrel. The mount may be configured to receive mount bolts 60. The front sight assembly may comprise a second elongated bar 16. The second elongated bar 16 may comprise a rear end adapted to removably connect to the mount 10. The mount 10 may define a second bore 52 adapted to securely receive the second elongated bar 16. The second bore 52 may be parallel to the first bore 50. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the second elongated bar 16. The second elongated bar 16 may comprise a front end opposite the rear end. The front end of the second elongated bar 16 may be adapted to removably connect to the front sight 12. The second elongated bar 16 may comprise a slot. The slot may be adapted to receive a mount pin 66 and/or a front sight pin 68. The mount pin 66 may be employed to reduce the potential for rotation of the second elongated bar 16 within the mount 10. The front sight pin 68 may be employed to reduce the potential for rotation of the second elongated bar 16 within the front sight 12. The second elongated bar 16 may be adapted to threadably receive a mount fastener 62. The mount fastener 62 may be employed to secure the second elongated bar 16 to the mount 10. The second elongated bar 16 may be adapted to threadably receive a front sight fastener 64. The front sight fastener 64 may be employed to secure the second elongated bar 16 to the front sight 12. The front sight 12 may define a third bore adapted to securely receive the second elongated bar 16. The third bore may include an internal shoulder 22 adapted to limit insertion of the second elongated bar 16.

[0106] According to an embodiment, a bayonet may be of a specific bayonet type. Bayonet types may include but are not limited to: OKC-3S, M9 Phrobis III, M7, M6, M5, M4, AKM Type II, AKM Type I, AK-74 bayonet 6Kh5, SKS-type, L3A1 socket, Type C socket, G3, Eickhorn KCB-70 type, Feldmesser 78, Feldmesser 81, and FAMAS. For example, a first bayonet may be of type M9 Phrobis III. For example, a second bayonet may be of type AK- 74 bayonet 6Kh5.

[0107] FIG. 8A and FIG. 8B illustrate an example bayonet mount connected to an example barrel 6 of an example firearm 2 and example bayonets according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The mounting block 70 may, for example, be structurally configured to clamp to the barrel 6. The mounting block 70 may, for example, be structurally configured to threadably connect to the barrel 6. The mounting block 70 may, for example, comprise a bore configured to receive barrel 6. In this example, the mounting block 70 may be structurally configured to be mechanically fastened to one or more dimples or one or more holes in the barrel 6. The example bayonets may comprise a first bayonet 80 and a second bayonet 90. The first bayonet 80 may comprise a pommel 82 with a first latch. The first bayonet 80 may comprise a first crossguard 84. The first crossguard 84 may define a first mounting ring bore of a first bore diameter. The bayonet mount may comprise a first adapter plate 72. The first adapter plate 72 may be adapted to receive the first latch of the first bayonet 80. The first adapter plate 72 may comprise a first catch. The first adapter plate 72 may be adapted to removably connect to the mounting block 70. The second bayonet 90 may comprise a pommel with a second latch. The pommel may be integrated into a handle of a bayonet. The second bayonet 90 may comprise a second crossguard 94. The second crossguard 94 may define a second mounting ring bore of a second bore diameter. The bayonet mount may comprise a second adapter plate 74. The second adapter plate 74 may be adapted to receive the second latch of the second bayonet 90. The second adapter plate 74 may be adapted to removably connect to the mounting block 70. The bayonet mount may comprise a bayonet stop 32. The bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The bayonet stop 32 may comprise a compensator. The bayonet stop 32 may be structurally configured to removably receive a flash hider 34 and/or a compensator. The bayonet stop 32 may be structurally configured to threadably receive a flash hider 34 and/or a compensator. The first bayonet 80 or the second bayonet 90 may be connected to the mounting block 70 and the bayonet stop 32 while a mount 10 is connected to the barrel 6 and a front sight 12 is connected to the mount 10 through employment of an elongated bar.

[0108] FIGS. 9A-10B illustrate cross-sectional views of an example bayonet mount connected to an example barrel 6 of an example firearm and example bayonets according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The bayonets may comprise a first bayonet 80 and a second bayonet 90. The first bayonet 80 may comprise a pommel 82 with a first latch. The first bayonet 80 may comprise a first crossguard 84. The first crossguard 84 may define a first mounting ring bore of a first bore diameter. The bayonet mount may comprise a first adapter plate 72. The first adapter plate 72 may be adapted to receive the first latch of the first bayonet 80. The first adapter plate 72 may be adapted to removably connect to the mounting block 70. The second bayonet 90 may comprise a pommel with a second latch. The second bayonet 90 may comprise a second crossguard 94. The second crossguard 94 may define a second mounting ring bore of a second bore diameter. The bayonet mount may comprise a second adapter plate 74. The second adapter plate 74 may be adapted to receive the second latch of the second bayonet 90. The second adapter plate 74 may be adapted to removably connect to the mounting block 70. The bayonet mount may comprise a bayonet stop 32. The bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The first bayonet 80 or the second bayonet 90 may be connected to the mounting block 70 and the bayonet stop 32 while a mount 10 is connected to the barrel 6 and a front sight 12 is connected to the mount 10 through employment of an elongated bar.

[0109] According to an embodiment, a bayonet stop (for example, 32) may have a first

cylindrical portion forward of a first shoulder. The first cylindrical portion may have a first diameter sized to be closely received in a first mounting ring bore. The first shoulder may be aft of the first cylindrical portion. The first shoulder may be adapted to abut a first rear surface of a first crossguard (for example, 84) to position a first latch in alignment with a first catch. The bayonet stop may include a second cylindrical portion adjacent to the first cylindrical portion. The second cylindrical portion may have a second diameter different than the first diameter, such that a second bayonet (for example, 90) having a second mounting ring bore of a second bore diameter may be closely received. The first cylindrical portion may be adjacent to the second cylindrical portion. The smaller of the first cylindrical portion and the second cylindrical portion may be forward of the larger of the first cylindrical portion and the second cylindrical portion. A second shoulder may be defined by a forward portion of the first cylindrical portion. The second shoulder may be aft of the second cylindrical portion. At least a portion of a flash hider (for example, 34) may comprise the second cylindrical portion.

[0110] FIG. 11 A and FIG. 1 IB illustrate an example bayonet mount connected to an example barrel 6 of an example firearm and a first bayonet 80 according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The first bayonet 80 may comprise a pommel 82 with a first latch. The bayonet mount may comprise a first adapter plate 72. The first adapter plate 72 may comprise a first catch. The first adapter plate 72 may be adapted to receive the first latch of the first bayonet 80. The first bayonet 80 may comprise a first crossguard 84. The first crossguard 84 may define a first mounting ring bore of a first bore diameter. The bayonet mount may comprise a bayonet stop 32. The bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The bayonet stop 32 may comprise a first cylindrical portion forward of a first shoulder 88. The first cylindrical portion may have a first diameter sized to be closely received in the first mounting ring bore. The first shoulder 88 may be aft of the first cylindrical portion. The first shoulder 88 may be adapted to abut a first rear surface of the first crossguard 84 to position the first latch in alignment with the first catch. A second shoulder may be defined by a forward portion of the first cylindrical portion. The first bayonet 80 may comprise a first mounting length between the first latch and the rear of the first rear surface of the first crossguard 84. The first catch of the first adapter plate 72 may be positioned aft of the first shoulder 88 by the first mounting length. The first bayonet 80 may be connected to the mounting block 70 and the bayonet stop 32 while a mount 10 is connected to the barrel 6 and a front sight 12 is connected to the mount 10 through employment of an elongated bar.

[0111] FIG. 12A and FIG. 12B illustrate an example bayonet mount connected to an example barrel 6 of an example firearm and a second bayonet 90 according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The second bayonet 90 may comprise a pommel with a second latch. The bayonet mount may comprise a second adapter plate 74. The second adapter plate 74 may comprise a second catch. The second adapter plate 74 may be adapted to receive the second latch of the second bayonet 90. The second bayonet 90 may comprise a second crossguard 94. The second crossguard 94 may define a second mounting ring bore of a second bore diameter. The bayonet mount may comprise a bayonet stop 32. The bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a first cylindrical portion forward of a first shoulder 88. The bayonet stop 32 may comprise a second cylindrical portion forward of a second shoulder 98. The second cylindrical portion may have a second diameter sized to be closely received in the second mounting ring bore. The first cylindrical portion may be adjacent to the second cylindrical portion. The second shoulder 98 may be defined by a forward portion of the first cylindrical portion. The second shoulder 98 may be aft of the second cylindrical portion. At least a portion of a flash hider 34 may comprise the second cylindrical portion. The second shoulder 98 may be adapted to abut a second rear surface of the second crossguard 94 to position the second latch in alignment with the second catch. The second bayonet 90 may comprise a second mounting length between the second latch and the rear of the second rear surface of the second crossguard 94. The second catch of the second adapter plate 74 may be positioned aft of the second shoulder 98 by the second mounting length. The second bayonet 90 may be connected to the mounting block 70 and the bayonet stop 32 while a mount 10 is connected to the barrel 6 and a front sight 12 is connected to the mount 10 through employment of an elongated bar.

2] According to an embodiment, a bayonet stop (for example, 32) may be adapted for supporting at least two different bayonets (for example, 80 and 90). The crossguard (for example, 84 or 94) of each of the at least two different bayonets may have a different ring bore diameter. The bayonet stop (for example, 32) may comprise a body adapted to connect to a rifle barrel (for example, 6). The body may have a first shoulder portion. The first shoulder portion may have a forward-facing first shoulder surface (for example, 88). The body may have a first cylindrical portion forward of the forward-facing first shoulder surface. The first cylindrical portion may have a first diameter. The first cylindrical portion may have a forward-facing second shoulder surface (for example, 98). The body may have a second cylindrical portion forward of the forward-facing second shoulder surface. The body may have a second diameter less than the first diameter. The body may comprise a flash hider (for example, 34). The flash hider may comprise at least a portion of the second cylindrical portion. At least a portion of the flash hider may comprise the second diameter. The first cylindrical portion may be adapted to closely receive a first ring bore of a first bayonet (for example, 80). The second cylindrical portion may be adapted to closely receive a second ring bore of a second bayonet (for example, 90). The second bayonet may be different from the first bayonet.

[0113] According to an embodiment, a bayonet stop may include a mounting block (for

example, 70) connected to a rifle barrel (for example, 6). The mounting block may be adapted to removably receive a plurality of adapter plates (for example, 72 and 74). Each of the plurality of adapter plates may be associated with a respective one of a plurality of bayonets. The plurality of bayonets may include a first bayonet (for example, 80). The plurality of bayonets may include a second bayonet (for example, 90).

[0114] FIG. 13A and FIG. 13B illustrate an example bayonet mount connected to an example barrel 6 of an example firearm according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The mounting block 70 may comprise a first block mating feature 76. The first block mating feature 76 may be adapted to closely receive one or more adapter plates. A bayonet stop 32 may comprise a body adapted to connect to the rifle barrel 6. The body may have a first shoulder portion. The first shoulder portion may have a forward-facing first shoulder surface 88. The body may have a first cylindrical portion 86 forward of the forward-facing first shoulder surface 88. The first cylindrical portion 86 may have a first diameter. The first cylindrical portion 86 may have a forward-facing second shoulder surface 98. The body may have a second cylindrical portion forward of the forward-facing second shoulder surface. The body may have a second diameter less than the first diameter. The body may comprise a flash hider 34. The flash hider may comprise at least a portion of the second cylindrical portion. At least a portion of the flash hider may comprise the second diameter. A mount 10 may be connected to the barrel 6. A front sight 12 may be connected to the mount 10 through employment of an elongated bar.

[0115] FIG. 14A and FIG. 14B illustrate an example bayonet mount with a first adapter plate 72 connected to an example barrel 6 of an example firearm according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The mounting block 70 may be connected to a first adapter plate 72. The first adapter plate 72 may comprise a first catch 172. The first catch 172 may be on an aft portion of the first adapter plate 72. The first catch 172 may comprise a first catch surface. The first catch surface may be adapted for selectable engagement by a first latch. The first latch may be associated with a first bayonet. A bayonet stop 32 may comprise a body adapted to connect to the rifle barrel 6. The body may have a first shoulder portion. The first shoulder portion may have a forward-facing first shoulder surface 88. The body may have a first cylindrical portion 86 forward of the forward-facing first shoulder surface 88. The first cylindrical portion 86 may have a first diameter. The first cylindrical portion 86 may have a forward-facing second shoulder surface 98. The body may have a second cylindrical portion forward of the forward-facing second shoulder surface. The body may have a second diameter less than the first diameter. The body may comprise a flash hider 34. The flash hider may comprise at least a portion of the second cylindrical portion. At least a portion of the flash hider may comprise the second diameter. A mount 10 may be connected to the barrel 6. A front sight 12 may be connected to the mount 10 through employment of an elongated bar.

[0116] FIG. 15A and FIG. 15B illustrate an example bayonet mount with a second adapter plate 74 connected to an example barrel 6 of an example firearm according to various aspects of an embodiment. The bayonet mount may comprise a mounting block 70. The mounting block 70 may be connected to the barrel 6. The mounting block 70 may be connected to a second adapter plate 74. The second adapter plate 74 may comprise a second catch 174. The second catch 174 may be on a forward portion of the second adapter plate 74. The second catch 174 may comprise a second catch surface. The second catch surface may be adapted for selectable engagement by a second latch. The second latch may be associated with a second bayonet. A bayonet stop 32 may comprise a body adapted to connect to the rifle barrel 6. The body may have a first shoulder portion. The first shoulder portion may have a forward-facing first shoulder surface 88. The body may have a first cylindrical portion 86 forward of the forward-facing first shoulder surface 88. The first cylindrical portion 86 may have a first diameter. The first cylindrical portion 86 may have a forward-facing second shoulder surface 98. The body may have a second cylindrical portion forward of the forward-facing second shoulder surface. The body may have a second diameter less than the first diameter. The body may comprise a flash hider 34. The flash hider may comprise at least a portion of the second cylindrical portion. At least a portion of the flash hider may comprise the second diameter. A mount 10 may be connected to the barrel 6. A front sight 12 may be connected to the mount 10 through employment of an elongated bar.

[0117] FIGs. 16 and 17 illustrate an example mounting block 70, first adapter plate 72, and second adapter plate 74 according to aspects of an embodiment. The mounting block 70 may comprise a first block mating feature 76. The first block mating feature 76 may be adapted to closely receive a first adapter plate 72. The first adapter plate 72 may comprise a first adapter mating feature 78. The first adapter mating feature 78 may be adapted to removably connect to the first block mating feature 76. The first adapter plate 72 may comprise a first catch 172. The first block mating feature 76 may be adapted to closely receive a second adapter plate 74. The second adapter plate 74 may comprise a first adapter mating feature 78. The second adapter plate 74 may comprise a second catch 174. The first adapter plate 72 and the second adapter plate 74 may be configured to secure to the mounting block 70 through employment of one or more fasteners.

[0118] FIG. 18 illustrates an example front sight assembly with an example adapter plate 72 installed on an example firearm 2 according to various aspects of an embodiment. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The firearm 2 may comprise an elongated forearm 222. The front sight assembly may comprise a mount 170. The mount 170 may comprise a first block mating feature. A first adapter plate 72 may comprise a first adapter mating feature adapted to removably connect to the first block mating feature. A first bayonet may comprise a pommel with a first latch. The first adapter plate 72 may be adapted to receive the first latch of the first bayonet. The first adapter plate 72 may comprise a first catch with a first catch surface. The first catch surface may be adapted for selectable engagement by the first latch. The mount 170 may be adapted to connect to the firearm 2. The front sight assembly may comprise a third elongated bar 18. The third elongated bar 18 may comprise a rear end adapted to removably connect to the mount 170. The third elongated bar 18 may comprise a front end opposite the rear end. The third elongated bar 18 may be a cylindrical rod. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the third elongated bar 18. The front end of the third elongated bar 18 may be adapted to removably connect to the front sight 12. The third elongated bar 18 may comprise a third length. The third length may establish a third sight radius between the rear sight 4 and the front sight 12. The third sight radius may be the same as a second sight radius. The front sight 12 may be positioned forward of the mount 170 by a distance based on the third length. A bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The bayonet stop 32 may comprise a compensator. The bayonet stop 32 may be structurally configured to threadably receive a flash hider 34 and/or a compensator.

[0119] FIG. 19 illustrates an example front sight assembly with an example adapter plate 72 installed on an example firearm 2 according to various aspects of an embodiment. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The firearm 2 may comprise an elongated forearm 222. The front sight assembly may comprise a mount 170. The mount 170 may be adapted to connect to the firearm 2. The front sight assembly may comprise a third elongated bar 18. The third elongated bar 18 may comprise a rear end adapted to removably connect to the mount 170. The third elongated bar 18 may comprise a front end opposite the rear end. The third elongated bar 18 may be a cylindrical rod. The front sight assembly may comprise a front sight 12. The front sight 12 may be adapted to removably connect to the third elongated bar 18. The front end of the third elongated bar 18 may be adapted to removably connect to the front sight 12. The third elongated bar 18 may comprise a third length. The third length may establish a third sight radius between the rear sight 4 and the front sight 12. The third sight radius may be the same as a second sight radius. The front sight 12 may be positioned forward of the mount 170 by a distance based on the third length. A bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The bayonet stop 32 may comprise a compensator. The bayonet stop 32 may be structurally configured to threadably receive a flash hider 34 and/or a compensator.

0] FIG. 20 illustrates an example bayonet mount with an example front sight 12 connected to an example barrel 6 of an example firearm 2 and an example bayonet 80 according to various aspects of an embodiment. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The firearm 2 may comprise an elongated forearm 222. The bayonet mount may comprise a mounting block 170. The mounting block 170 may be connected to the barrel 6. The mounting block 170 may, for example, be structurally configured to clamp to the barrel 6. The mounting block 170 may, for example, be structurally configured to threadably connect to the barrel 6. The mounting block 170 may, for example, comprise a bore configured to receive barrel 6. In this example, the mounting block 170 may be structurally configured to be mechanically fastened to one or more dimples or one or more holes in the barrel 6. A first bayonet 80 may comprise a pommel 82 with a first latch. The first bayonet 80 may comprise a first crossguard 84. The first crossguard 84 may define a first mounting ring bore of a first bore diameter. The mounting block 170 may comprise a first block mating feature. The bayonet mount may comprise a first adapter plate 72. The first adapter plate 72 may comprise a first adapter mating feature adapted to removably connect to the first block mating feature. The first adapter plate 72 may be adapted to receive the first latch of the first bayonet 80. The first adapter plate 72 may comprise a first catch. The bayonet mount may comprise a bayonet stop 32. The bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The bayonet stop 32 may comprise a compensator. The bayonet stop 32 may be structurally configured to threadably receive a flash hider 34 and/or a compensator. The mounting block 170 may be adapted to removably connect to a third elongated bar 18. The third elongated bar 18 may comprise a rear end adapted to removably connect to the mounting block 170. The third elongated bar 18 may comprise a front end opposite the rear end. The third elongated bar 18 may be a cylindrical rod. The bayonet mount may comprise a front sight 12 . The front sight 12 may be adapted to removably connect to the third elongated bar 18. The front end of the third elongated bar 18 may be adapted to removably connect to the front sight 12. The third elongated bar 18 may comprise a third length. The third length may establish a third sight radius between the rear sight 4 and the front sight 12. The front sight 12 may be positioned forward of the mounting block 170 by a distance based on the third length.

[0121] FIG. 21 illustrates an example bayonet mount with a front sight 12 connected to an example barrel 6 of an example firearm 2 and an example bayonet 80 according to various aspects of an embodiment. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a barrel 6. The firearm 2 may comprise an elongated forearm 222. The bayonet mount may comprise a mounting block 170. The mounting block 170 may be connected to the barrel 6. A first bayonet 80 may comprise a pommel 82 with a first latch. The first bayonet 80 may comprise a first crossguard 84. The mounting block 170 may comprise a first block mating feature. The bayonet mount may comprise a first adapter plate 72. The first adapter plate 72 may comprise a first adapter mating feature adapted to removably connect to the first block mating feature. The first adapter plate 72 may be adapted to receive the first latch of the first bayonet 80. The first adapter plate 72 may comprise a first catch. The bayonet mount may comprise a bayonet stop 32. The bayonet stop 32 may be connected to the barrel 6. The bayonet stop 32 may comprise a flash hider 34. The mounting block 170 may be adapted to removably connect to a third elongated bar 18. The third elongated bar 18 may comprise a rear end adapted to removably connect to the mounting block 170. The third elongated bar 18 may comprise a front end opposite the rear end. The third elongated bar 18 may be a cylindrical rod. The bayonet mount may comprise a front sight 12 . The front sight 12 may be adapted to removably connect to the third elongated bar 18. The front end of the third elongated bar 18 may be adapted to removably connect to the front sight 12. The third elongated bar 18 may comprise a third length. The third length may establish a third sight radius between the rear sight 4 and the front sight 12. The front sight 12 may be positioned forward of the mounting block 170 by a distance based on the third length.

[0122] FIG. 22 illustrates an example elongated forearm connected to an example frame 2 of an example rifle with an example barrel 6 according to various aspects of an embodiment. The rifle may comprise the frame 2. The frame 2 may also be referred to as a receiver. The rifle may comprise a barrel 6. The barrel 6 may be connected to the frame 2. The rifle may comprise an elongated forearm. The elongated forearm may comprise an upper portion 212 and a lower portion 202. The elongated forearm may define a barrel passage adapted to receive the barrel 6. The elongated forearm may define an elongated cylindrical passage above the barrel passage. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a front sight assembly. The front sight assembly may comprise a mount 10. The front sight assembly may comprise a front sight 12.

[0123] According to an embodiment, at least a portion of an elongated cylindrical passage may comprise a shape of at least a portion of a star style gas tube. The elongated cylindrical passage may be compatible with a gas piston for a gas piston operated rifle. Examples of gas piston operated rifles include but are not limited to AK-47, AK-74, HK416, and AR-15.

[0124] FIG. 23 illustrates an example elongated forearm 222 connected to an example frame 2 of an example rifle with an example barrel 6 according to various aspects of an

embodiment. The rifle may comprise the frame 2. The rifle may comprise a barrel 6. The barrel 6 may be connected to the frame 2. The rifle may comprise an elongated forearm 222. The elongated forearm 222 may comprise a single integral element. The elongated forearm 222 may define a barrel passage adapted to receive the barrel 6. The elongated forearm 222 may define an elongated cylindrical passage above the barrel passage. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a front sight assembly. The front sight assembly may comprise a mount 10. The front sight assembly may comprise a front sight 12.

[0125] FIG. 24A and FIG. 24B illustrate cross-sectional views of example elongated forearms for an example gas piston operated rifle according to various aspects of an embodiment. The rifle may comprise a frame 2. The rifle may comprise a barrel 6. The barrel 6 may be connected to the frame 2. The rifle may comprise an elongated forearm. The elongated forearm (for example 222) may comprise a single integral element. The single integral element may define an elongated cylindrical passage. The elongated forearm may comprise an upper portion 212 and a lower portion 202. The elongated forearm may define a barrel passage adapted to receive the barrel 6. The elongated forearm may define the elongated cylindrical passage above the barrel passage. The rifle may comprise a bolt aligned with the barrel 6. The bolt may be operable to reciprocate in the frame 2. The rifle may comprise a gas block 232 connected to the barrel 6. The gas block 232 may define a gas passage 230 in communication with the barrel 6. The elongated cylindrical passage may have a forward end in communication with the gas passage 230. The elongated forearm may define a gas passage having a forward opening 242. The forward opening 242 may be adapted to receive gas pressure from a gas block. The gas passage may have a rear opening opposed to the forward opening 242. The elongated cylindrical passage may have a rear end. The elongated cylindrical passage may have an enclosed intermediate portion 240 extending between the forward end and the rear end. The rifle may comprise an operating rod 234. The operating rod 234 may have a rear end 236 adapted to motivate the bolt. The operating rod 234 may have a forward free end with a cylinder head 238. The cylinder head 238 may be closely received in the enclosed intermediate portion of the elongated cylindrical passage. The cylinder head 238 may be closely received in the gas passage 230. The operating rod 234 may extend rearward from the cylinder head 238. The operating rod 234 may extend from the rear opening. The firearm 2 may comprise a rear sight 4. The firearm 2 may comprise a front sight assembly. The front sight assembly may comprise a mount 10. The front sight assembly may comprise a front sight 12. The front sight assembly may comprise a second elongated bar 16. The elongated forearm may define external rail mounting structures. The external rail mounting structures may comprise an upper rail mounting structure 250. The external rail mounting structures may comprise a lower rail mounting structure 252.

[0126] According to an embodiment, an elongated forearm may comprise a containment wall.

The containment wall may comprise an interior surface defining an enclosed intermediate portion (for example, 240) of an elongated cylindrical passage. The containment wall may comprise an external surface exposed to atmosphere for heat dissipation. The elongated forearm may be formed of aluminum.

[0127] FIG. 25A and FIG. 25B illustrate example handguards for a gas piston operated rifle according to various aspects of an embodiment. In this disclosure, a handguard may be referred to as an elongated forearm. A handguard (for example, 222) may comprise a single integral element. The single integral element may define an elongated cylindrical passage. The handguard may comprise an upper portion 212 and a lower portion 202. The upper portion 212 and the lower portion 202 may be fastened together through employment of one or more fasteners. One or more clearance holes 214 may be adapted to receive the one or more fasteners (as shown in the upper portion 212). The handguard may comprise an elongated body. The elongated body may be formed of aluminum. The elongated body may define an elongated barrel passage 262. The elongated barrel passage 262 may be adapted to receive a barrel. The elongated body may define a gas passage having a forward opening 242. The forward opening 242 may be adapted to receive gas pressure from a gas block. The gas passage may have a rear opening opposed to the forward opening 242. The gas passage may be enclosed except at the forward opening 242 and the rear opening. The gas passage may be enclosed once installed on a rifle with a gas block. The elongated body may define the elongated cylindrical passage above the barrel passage 262. The elongated cylindrical passage may have a forward end in communication with the gas passage. The elongated body may define external rail mounting structures. The external rail mounting structures may comprise an upper rail 250. The external rail mounting structures may comprise a lower rail 252.

[0128] FIG. 26A and FIG. 26B illustrate example handguards for a gas piston operated rifle according to various aspects of an embodiment. A handguard (for example, 222) may comprise a single integral element. The single integral element may define an elongated cylindrical passage. The handguard may comprise an upper portion 212 and a lower portion 202. The upper portion 212 and the lower portion 202 may be fastened together through employment of one or more fasteners. One or more clearance holes 214 may be adapted to receive the one or more fasteners (as shown in the upper portion 212). The handguard may comprise an elongated body. The elongated body may define an elongated barrel passage 262. The elongated barrel passage 262 may be adapted to receive a barrel. The elongated body may define the elongated cylindrical passage above the barrel passage 262. The elongated cylindrical passage may have a rear end 244. The elongated body may define one or more external rail mounts. The one or more external rail mounts may comprise an upper rail mount 250. The one or more external rail mounts may comprise a lower rail mount 252. The elongated body may be adapted to connect to a frame of the gas piston operated rifle through employment of at least one frame connector 266.

[0129] FIG. 27 illustrates an example lower portion 202 of an example two-piece handguard according to an aspect of an embodiment. The lower portion 202 may comprise an elongated body. The elongated body may define an elongated barrel passage 262. The elongated body may be adapted to connect to a frame of a gas piston operated rifle through employment of at least one frame connector 266. The elongated body may define an external rail mount 252. The elongated body may comprise vents. The elongated body may comprise mounting slots for accessories. Examples of mounting slots include KeyMod slots, M-LOK slots, Magpul Original Equipment (MOE) slots, combinations thereof, and/or the like.

[0130] FIG. 28A illustrates a rear view of an example lower portion 202 of an example two- piece handguard according to an aspect of an embodiment. The lower portion 202 may comprise an elongated body. The elongated body may define an elongated barrel passage 262. The elongated body may be adapted to connect to a frame of a gas piston operated rifle through employment of at least one frame connector 266. [0131] FIG. 28B illustrates a front view of an example lower portion 202 of an example two- piece handguard according to an aspect of an embodiment. The lower portion 202 may comprise an elongated body. The elongated body may define an elongated barrel passage 262. The elongated body may define an external rail mount 252.

[0132] FIG. 29 illustrates an example upper portion 212 of an example two-piece handguard according to an aspect of an embodiment. The upper portion 212 may comprise an elongated body. The elongated body may define a gas passage having a forward opening 242. The upper portion 212 may be fastened to a lower portion through employment of one or more fasteners. One or more clearance holes 214 may be adapted to receive the one or more fasteners. The elongated body may define an external rail mount 250.

[0133] FIG. 30A illustrates a rear view of an example upper portion 212 of an example two- piece handguard according to an aspect of an embodiment. The upper portion 212 may comprise an elongated body. The elongated body may define an elongated cylindrical passage. The elongated cylindrical passage may have a rear end 244. The elongated body may define an external rail mount 250.

[0134] FIG. 30B illustrates a front view of an example upper portion 212 of an example two- piece handguard according to an aspect of an embodiment. The upper portion 212 may comprise an elongated body. The elongated body may define a gas passage having a forward opening 242. The elongated body may define an external rail mount 250.

[0135] According to an embodiment, a gas passage may be parallel to an elongated barrel passage. The gas passage may be above the elongated barrel passage. The gas passage may be a straight cylindrical bore. The gas passage may be seamless along its length.

[0136] There is thus provided, in accordance with an embodiment of the present disclosure, a front sight assembly for a firearm. The firearm may comprise a rear sight. The front sight assembly may comprise a mount. The mount may be adapted to connect to the firearm. The front sight assembly may comprise a first elongated bar. The first elongated bar may have a rear end adapted to removably connect to the mount. The first elongated bar may have a front end opposite the rear end. The front sight assembly may comprise a front sight adapted to removably connect to the first elongated bar. The first elongated bar may have a first length establishing a first sight radius between the rear sight and the front sight.

[0137] According to an embodiment, a mount may be adapted to removably connect to a second elongated bar having a second length different from a first length, such that a second sight radius different from a first sight radius is provided. [0138] According to an embodiment, a front sight may be adapted to removably connect to a second elongated bar having a second length different from a first length, such that a second sight radius different from a first sight radius is provided.

[0139] According to an embodiment, a front sight may be adapted to removably connect to a second elongated bar.

[0140] According to an embodiment, a plurality of different length elongated bars may each be adapted to removably connect to a mount and to a front sight.

[0141] According to an embodiment, a front sight may be positioned forward of a mount by a distance based on a first length.

[0142] According to an embodiment, a front sight may be positioned forward of a mount by a distance based on a second length.

[0143] According to an embodiment, a front sight may be positioned forward of a mount by a plurality of distances each based on a length of one of a plurality of different length elongated bars.

[0144] According to an embodiment, a mount may define a first bore adapted to securely receive a barrel. The mount may define a second bore adapted to securely receive a first elongated bar.

[0145] According to an embodiment, a second bore may be further adapted to securely receive a second elongated bar.

[0146] According to an embodiment, a second bore may be further adapted to securely receive any of a plurality of different length elongated bars.

[0147] According to an embodiment, a second bore may be parallel to a first bore.

[0148] According to an embodiment, a second bore may include an internal shoulder adapted to limit insertion of a first elongated bar.

[0149] According to an embodiment, a second bore may include an internal shoulder adapted to limit insertion of a second elongated bar.

[0150] According to an embodiment, a second bore may include an internal shoulder adapted to limit insertion of any of a plurality of different length elongated bars.

[0151] According to an embodiment, a first elongated bar may be a cylindrical rod.

[0152] According to an embodiment, a second elongated bar may be a cylindrical rod.

[0153] According to an embodiment, each of a plurality of different length elongated bars may be a cylindrical rod.

[0154] According to an embodiment, a mount may comprises a first block mating feature. A front sight assembly may comprise a first adapter plate. The first adapter plate may have a first adapter mating feature adapted to removably connect to the first block mating feature. The first adapter plate may have a first catch with a first catch surface adapted for selectable engagement by a first latch of a pommel of a first bayonet.

[0155] There is thus provided, in accordance with an embodiment of the present disclosure, a bayonet mount for a rifle and a first bayonet. The first bayonet may comprise a pommel with a first latch. The first bayonet may comprise a first crossguard defining a first mounting ring bore of a first bore diameter. The bayonet mount may comprise a mounting block adapted to securely connect to the rifle. The mounting block may comprise a first block mating feature. The bayonet mount may comprise a first adapter plate having a first adapter mating feature adapted to removably connect to the first block mating feature. The first adapter plate may comprise a first catch with a first catch surface adapted for selectable engagement by the first latch. The bayonet mount may comprise a bayonet stop connected to a barrel of the rifle. The bayonet stop may comprise a first cylindrical portion forward of a first shoulder. The first cylindrical portion may comprise a first diameter sized to be closely received in the first mounting ring bore. The first shoulder may be aft of the first cylindrical portion. The first shoulder may be adapted to abut a first rear surface of the first crossguard to position the first latch in alignment with the first catch.

[0156] According to an embodiment, a bayonet stop may include a second cylindrical portion adjacent to a first cylindrical portion. The second cylindrical portion may have a second diameter different than a first diameter, such that a second bayonet having a second mounting ring bore of a second bore diameter may be closely received.

[0157] According to an embodiment, a first cylindrical portion may be adjacent to a second cylindrical portion.

[0158] According to an embodiment, the smaller of a first cylindrical portion and a second cylindrical portion may be forward of the larger of the first cylindrical portion and the second cylindrical portion.

[0159] According to an embodiment, a bayonet mount may include a second shoulder defined by a forward portion of a first cylindrical portion.

[0160] According to an embodiment, a second shoulder may be aft of a second cylindrical portion.

[0161] According to an embodiment, a bayonet mount may include a second adapter plate having a first adapter mating feature adapted to removably connect to a first block mating feature. The second adapter plate may have a second catch with a second catch surface adapted for selectable engagement by a second latch associated with a second bayonet different from a first bayonet. [0162] According to an embodiment, a first bayonet may have a first mounting length between the first latch and the rear of a first rear surface of a first crossguard. A first catch of a first adapter plate may be positioned aft of a first shoulder by the first mounting length.

[0163] According to an embodiment, a second bayonet may have a second mounting length between a second latch and the rear of a second rear surface of a second crossguard. A second catch of a second adapter plate may be positioned aft of a second shoulder by the second mounting length.

[0164] According to an embodiment, a first catch may be on an aft portion of a first adapter plate.

[0165] According to an embodiment, a second catch may be on a forward portion of a second adapter plate.

[0166] According to an embodiment, a bayonet mount may include a first elongated bar

having a rear end adapted to removably connect to a mounting block. The first elongated bar may have a front end opposite the rear end. The bayonet mount may further include a front sight adapted to removably connect to a first elongated bar. The first elongated bar may have a first length establishing a first sight radius between a rear sight of a rifle and the front sight.

[0167] There is thus provided, in accordance with an embodiment of the present disclosure, a bayonet stop adapted for supporting at least two different bayonets. Each of the at least two different bayonets may comprise a different ring bore diameter. The bayonet stop may comprise a body. The body may be adapted to connect to a rifle barrel. The body may comprise a first shoulder portion. The first shoulder portion may comprise a forward-facing first shoulder surface. The body may comprise a first cylindrical portion. The first cylindrical portion may be forward of the forward-facing first shoulder surface. The first cylindrical portion may comprise a first diameter. The first cylindrical portion may comprise a forward-facing second shoulder surface. The body may comprise a second cylindrical portion. The second cylindrical portion may be forward of the forward-facing second shoulder surface. The second cylindrical portion may comprise a second diameter. The second diameter may be less than the first diameter.

[0168] According to an embodiment, a first cylindrical portion may be adapted to closely receive a first ring bore of a first bayonet.

[0169] According to an embodiment, a second cylindrical portion may be adapted to closely receive a second ring bore of a second bayonet different from a first bayonet.

[0170] According to an embodiment, a bayonet stop may comprise a mounting block

connected to a rifle barrel and adapted to removably receive a plurality of adapter plates each associated with a respective one of a plurality of bayonets, the plurality of bayonets including a first bayonet.

[0171] According to an embodiment, a bayonet stop may include a mounting block connected to a rifle barrel and adapted to removably receive a plurality of adapter plates each associated with a respective one of a plurality of bayonets, the plurality of bayonets including a first bayonet and a second bayonet.

[0172] According to an embodiment, a bayonet stop may include a flash hider. A body of the bayonet stop may be adapted to removably receive the flash hider.

[0173] There is thus provided, in accordance with an embodiment of the present disclosure, a rifle. The rifle may comprise a frame. The rifle may comprise a barrel connected to the frame. The rifle may comprise a bolt aligned with the barrel operable to reciprocate in the frame. The rifle may comprise a gas block connected to the barrel and may define a gas passage in communication with the barrel. The rifle may comprise an elongated forearm defining a barrel passage receiving the barrel. The elongated forearm may define an elongated cylindrical passage above the barrel passage. The elongated cylindrical passage may comprise a forward end in communication with the gas passage. The elongated cylindrical passage may comprise a rear end. The elongated cylindrical passage may comprise an enclosed intermediate portion extending between the forward end and the rear end. The rifle may comprise an operating rod having a rear end adapted to motivate the bolt and having a forward free end. The forward free end may comprise a cylinder head closely received in the enclosed intermediate portion of the elongated cylindrical passage.

[0174] According to an embodiment, an elongated forearm may be a single integral element.

[0175] According to an embodiment, an elongated forearm may include a single integral element defining an elongated cylindrical passage.

[0176] According to an embodiment, an elongated forearm may define external rail mounting structures.

[0177] According to an embodiment, an elongated forearm may comprise a containment wall.

The containment wall may comprise an interior surface defining an enclosed intermediate portion of an elongated cylindrical passage. The containment wall may comprise an external surface exposed to atmosphere for heat dissipation.

[0178] According to an embodiment, an elongated forearm may be formed of aluminum.

[0179] There is thus provided, in accordance with an embodiment of the present disclosure, a handguard for a gas piston operated rifle. The handguard may comprise an elongated body defining an elongated barrel passage. The elongated body may define a gas passage. The gas passage may comprise a forward opening adapted to receive gas pressure from a gas block. The gas passage may comprise a rear opening opposed to the forward opening. The gas passage may be enclosed except at the forward opening and the rear opening.

[0180] According to an embodiment, a cylinder head may be closely received in a gas

passage. An operating rod may extend rearward from the cylinder head.

[0181] According to an embodiment, an operating rod may extend from a rear opening.

[0182] According to an embodiment, a gas passage may be parallel to an elongated barrel passage.

[0183] According to an embodiment, a gas passage may be above an elongated barrel passage.

[0184] According to an embodiment, an elongated body may be a single integral element defining a gas passage.

[0185] According to an embodiment, an elongated body may be formed of aluminum.

[0186] According to an embodiment, a gas passage may be a straight cylindrical bore.

[0187] According to an embodiment, a gas passage may be seamless along its length.

[0188] According to an embodiment, an elongated body may define an external rail mount.

[0189] Various embodiments have been presented. Each of these embodiments may of course include features from other embodiments presented, and embodiments not specifically described may include various features described herein.

[0190] A person of ordinary skill in the art will appreciate that components shown in and described with respect to the figures are provided by way of example only. Numerous other configurations are possible. Accordingly, embodiments of the present disclosure should not be construed as being limited to any particular configuration. It will be appreciated that while the disclosure may in certain instances describe a single example embodiment, there may be other configurations, shapes, and orientations of facilities and components without departing from example embodiments of the present disclosure. A person of ordinary skill in the art will recognize the applicability of embodiments of the present disclosure to various firearms, firearm platforms, firearm components, firearm accessories, and combinations thereof known in the art. A person of ordinary skill in the art may recognize that embodiments of the present disclosure may comprise forged, milled, printed, combinations thereof, and/or the like parts comprising one material or a plurality of materials. A person of ordinary skill in the art will appreciate that components and elements shown in and described with respect to FIGS. 1-30 are provided by way of example only. Numerous other firearms, barrels, flash hiders, suppressors, handguards, and various firearm component configurations are possible. Accordingly, embodiments of the present disclosure should not be construed as being limited to any particular firearm, firearm platform, or firearm component. Additionally, it is to be recognized that, while the present disclosure has been described above in terms of one or more embodiments, it is not limited thereto. Various features, aspects, and/or components of the above described present disclosure may be used individually or jointly. Accordingly, the claims set forth below should be construed in view of the full breadth of the embodiments as disclosed herein.

[0191] In this specification, "a" and "an" and similar phrases are to be interpreted as "at least one" and "one or more." References to "a", "an", and "one" are not to be interpreted as "only one". References to "an" embodiment in this disclosure are not necessarily to the same embodiment.

[0192] Furthermore, many features presented above are described as being optional through the use of "may" or the use of parentheses. For the sake of brevity and legibility, the present disclosure does not explicitly recite each and every permutation that may be obtained by choosing from the set of optional features. However, the present disclosure is to be interpreted as explicitly disclosing all such permutations. For example, a system described as having three optional features may be embodied in seven different ways, namely with just one of the three possible features, with any two of the three possible features or with all three of the three possible features.

[0193] Further, the purpose of the Abstract of the Disclosure is to enable the Patent Office and the public generally, and especially the scientists, engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The Abstract of the Disclosure is not intended to be limiting as to the scope in any way.

[0194] Finally, it is the applicant's intent that only claims that include the express language "means for" or "step for" be interpreted under 35 U.S.C. 112. Claims that do not expressly include the phrase "means for" or "step for" are not to be interpreted under 35 U.S.C. 112.