A buffer tube for a firearm can include a body defining an interior cavity for receiving a buffer spring, and a rail disposed on and/or formed from the outer surface of the body. The rail can include one or more pin holes configured to receive a pin of a stock to lock the stock in a position, and a trunk opening defined at an end of the rail forming a first rail sidewall and second rail sidewall configured to receive a trunk of an actuator. The first and/or second rail sidewalls can include a slot defined therethrough configured to receive a pin associated with the trunk of the actuator to linearly guide the actuator. The rail can include a slide bar channel defined through at least a portion of the rail and configured to allow a slide bar to slide therein relative to the one or more pin holes to urge a pin out of a respective pin hole and/or to block a pin from being received by the pin holes.

A buffer tube for a firearm can include a body defining an interior cavity for receiving a buffer spring, and a rail disposed on and/or formed from the outer surface of the body. The rail can include one or more pin holes configured to receive a pin of a stock to lock the stock in a position, and a trunk opening defined at an end of the rail forming a first rail sidewall and second rail sidewall configured to receive a trunk of an actuator. The first and/or second rail sidewalls can include a slot defined therethrough configured to receive a pin associated with the trunk of the actuator to linearly guide the actuator. The rail can include a slide bar channel defined through at least a portion of the rail and configured to allow a slide bar to slide therein relative to the one or more pin holes to urge a pin out of a respective pin hole and/or to block a pin from being received by the pin holes.

Multi-part buffer tubes, methods of manufacturing the same, and firearms including the same are disclosed. In embodiments the multi-part buffer tube includes a cap, and a body that includes a tube. The tube may include a wall with an outward facing side, an inward facing side, a first end, and a second end. The inward facing side of the wall may define a cavity for receiving a buffer and a buffer spring for a firearm. The cap that is coupled to the body in any suitable manner For example, at least a portion of the cap may be disposed within a channel formed in the inward facing side of the tube, e.g., proximate the first end of the wall.

Multi-part buffer tubes, methods of manufacturing the same, and firearms including the same are disclosed. In embodiments the multi-part buffer tube includes a cap, and a body that includes a tube. The tube may include a wall with an outward facing side, an inward facing side, a first end, and a second end. The inward facing side of the wall may define a cavity for receiving a buffer and a buffer spring for a firearm. The cap that is coupled to the body in any suitable manner For example, at least a portion of the cap may be disposed within a channel formed in the inward facing side of the tube, e.g., proximate the first end of the wall.

A buttstock assembly configured to work in conjunction with a compact buffer assembly consisting of a buffer tube, spring and bolt carrier with an integral buffer is provided. The buttstock assembly, buffer tube and bolt carrier are configured to work with AR15/M16 type firearms and their derivatives. By incorporating the buffer onto the bolt carrier, which is used in conjunction with a buffer tube of reduced length, the overall length of the host firearm is reduced by approximately 3.2 inches. No permanent modification need be made to the host firearm in order to utilize the compact buffer assembly and buttstock assembly disclosed herein.

A buttstock assembly configured to work in conjunction with a compact buffer assembly consisting of a buffer tube, spring and bolt carrier with an integral buffer is provided. The buttstock assembly, buffer tube and bolt carrier are configured to work with AR15/M16 type firearms and their derivatives. By incorporating the buffer onto the bolt carrier, which is used in conjunction with a buffer tube of reduced length, the overall length of the host firearm is reduced by approximately 3.2 inches. No permanent modification need be made to the host firearm in order to utilize the compact buffer assembly and buttstock assembly disclosed herein.

A firearm as disclosures herein comprises a main receiver body, a barrel, a breech bolt structure, a buffer assembly, a trigger group assembly, a bolt catch and at least one of an auto-sear, a magazine adapter and a breech bolt anti-rotation structure. The main receiver body is preferably of a monolithic construction whereby the handguard and breech bolt carrying bore can be manufactured from a single piece of material. The auto-sear is tripped by engagement with a buffer of the buffer assembly. The magazine adapter has an exterior surface structure engaged with a mating interior surface structure of a magazine well space of the main receiver body. A distal end portion of the breech bolt anti-rotation structure is engageable by the buffer for limiting forward travel of the buffer when the barrel is detached from the main receiver body.

A firearm as disclosures herein comprises a main receiver body, a barrel, a breech bolt structure, a buffer assembly, a trigger group assembly, a bolt catch and at least one of an auto-sear, a magazine adapter and a breech bolt anti-rotation structure. The main receiver body is preferably of a monolithic construction whereby the handguard and breech bolt carrying bore can be manufactured from a single piece of material. The auto-sear is tripped by engagement with a buffer of the buffer assembly. The magazine adapter has an exterior surface structure engaged with a mating interior surface structure of a magazine well space of the main receiver body. A distal end portion of the breech bolt anti-rotation structure is engageable by the buffer for limiting forward travel of the buffer when the barrel is detached from the main receiver body.

The invention provides improved modular gun stocks and their methods of manufacture. Advantageously, gun stocks of the invention require fewer parts than conventional gun stocks. The lower stock supports of the improved modular gun stocks can be removed and replaced in multiple ways so that a variety of gun stocks can be created as desired. The invention also eliminates the undesirable rattling noise that modular gun stocks often have after assembly.

The invention provides improved modular gun stocks and their methods of manufacture. Advantageously, gun stocks of the invention require fewer parts than conventional gun stocks. The lower stock supports of the improved modular gun stocks can be removed and replaced in multiple ways so that a variety of gun stocks can be created as desired. The invention also eliminates the undesirable rattling noise that modular gun stocks often have after assembly.