A self-locking bolt assembly is provided having a short stroke allowing the assembly to be contained within the receiver. The assembly has a base plate, a recoil rod with a spring, a bolt body, a bolt and a locking mechanism. The bolt is internally (i.e. lockable onto itself) lockable when the bolt is in battery. The locking mechanism, for example, can be a roller bearing, a lever lock, a cam rotary lock or a roller. The locking mechanism engages to recoil rod and prevents rearward motion of the bolt. Blowback and reciprocation of the bolt are temporarily delayed after a shot is fired until after the bolt is unlocked. Rearward movement of the bolt body due to inertia causes the locking mechanism to be disengaged to unlock the bolt and to allow for reciprocation of the bolt.

A self-locking bolt assembly is provided having a short stroke allowing the assembly to be contained within the receiver. The assembly has a base plate, a recoil rod with a spring, a bolt body, a bolt and a locking mechanism. The bolt is internally (i.e. lockable onto itself) lockable when the bolt is in battery. The locking mechanism, for example, can be a roller bearing, a lever lock, a cam rotary lock or a roller. The locking mechanism engages to recoil rod and prevents rearward motion of the bolt. Blowback and reciprocation of the bolt are temporarily delayed after a shot is fired until after the bolt is unlocked. Rearward movement of the bolt body due to inertia causes the locking mechanism to be disengaged to unlock the bolt and to allow for reciprocation of the bolt.

The invention relates to a breech system for a firearm, having a bolt receiver and a bolt; the bolt receiver is embodied in the form of a hollow cylinder at least with engagement means protruding radially inward and there is also at least one bolt head, which has outward-protruding engagement means that correspond to the inward-protruding engagement means; the bolt head is supported in rotary fashion on a bolt carrier and there is also a bolt body, which is able to slide on a bolt head shaft of the bolt head, and between the bolt body and the bolt carrier, there is at least one compression spring, which tends to move the bolt body in the direction toward the bolt head; and on the bolt head shaft and on the bolt body, there are means that produce a rotation of the bolt head when the bolt body is slid on the bolt head shaft.

The invention relates to a breech system for a firearm, having a bolt receiver and a bolt; the bolt receiver is embodied in the form of a hollow cylinder at least with engagement means protruding radially inward and there is also at least one bolt head, which has outward-protruding engagement means that correspond to the inward-protruding engagement means; the bolt head is supported in rotary fashion on a bolt carrier and there is also a bolt body, which is able to slide on a bolt head shaft of the bolt head, and between the bolt body and the bolt carrier, there is at least one compression spring, which tends to move the bolt body in the direction toward the bolt head; and on the bolt head shaft and on the bolt body, there are means that produce a rotation of the bolt head when the bolt body is slid on the bolt head shaft.

An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearms gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pins annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end and an extractor recess. The extractor recess is constructed to accommodate an enlarged extractor claw while not undercutting the bolt lugs adjacent thereto. The extractor engages approximately 57% more of a seated ammunition cartridges rim as compared to some prior art AR15/M16 type extractors used with automatic firearms chambered in 6.8SPC. The result is an improved bolt and bolt carrier which provides for increased operational reliability.

An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearms gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pins annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end and an extractor recess. The extractor recess is constructed to accommodate an enlarged extractor claw while not undercutting the bolt lugs adjacent thereto. The extractor engages approximately 57% more of a seated ammunition cartridges rim as compared to some prior art AR15/M16 type extractors used with automatic firearms chambered in 6.8SPC. The result is an improved bolt and bolt carrier which provides for increased operational reliability.

System for a multi-caliber self-loading action. Specifically, the system is comprised of a multi-position locking assembly and a self-regulating gas assembly. The multi-position locking assembly is comprised of a bolt carrier, a spring, a bolt, a lock, and a cam assembly. The cam assembly will interface between the bolt carrier and the bolt to rotate the bolt through the bolt carrier. The lock will interface with the bolt, to lock the bolt in at least one locked position based on the caliber of the round inserted. The self-regulating gas assembly directs gas from the gas regulation to at least one piston cup, which will then cause the piston to act on the multi-position locking assembly.

System for a multi-caliber self-loading action. Specifically, the system is comprised of a multi-position locking assembly and a self-regulating gas assembly. The multi-position locking assembly is comprised of a bolt carrier, a spring, a bolt, a lock, and a cam assembly. The cam assembly will interface between the bolt carrier and the bolt to rotate the bolt through the bolt carrier. The lock will interface with the bolt, to lock the bolt in at least one locked position based on the caliber of the round inserted. The self-regulating gas assembly directs gas from the gas regulation to at least one piston cup, which will then cause the piston to act on the multi-position locking assembly.

A rotating bolt firearm may be configured to fire a .308 cartridge. However, the firearm may have a reduced weight in comparison to standard .308 rifles. The firearm may have many components typically used in a .223 rifle. The firearm may include a barrel extension with an extractor gap, which allows a .308 bolt to fit within a .223 sized barrel extension. The firearm may comprise an elongated magazine well in comparison to a .223 mil-spec rifle. The firearm may weigh less than 6.8 pounds with a 16-inch barrel, or less than 6.3 pounds with a 10.5 inch barrel.

A rotating bolt firearm may be configured to fire a .308 cartridge. However, the firearm may have a reduced weight in comparison to standard .308 rifles. The firearm may have many components typically used in a .223 rifle. The firearm may include a barrel extension with an extractor gap, which allows a .308 bolt to fit within a .223 sized barrel extension. The firearm may comprise an elongated magazine well in comparison to a .223 mil-spec rifle. The firearm may weigh less than 6.8 pounds with a 16-inch barrel, or less than 6.3 pounds with a 10.5 inch barrel.