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 firearm's gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pin's annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end. The extractor recess is constructed so that the face of the bolt is round and the adjacent lugs fully supported. The extractor engages approximately 17% more of a seated ammunition cartridge's rim as compared to the prior art AR15/M16 extractor. 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 firearm's gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pin's annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end. The extractor recess is constructed so that the face of the bolt is round and the adjacent lugs fully supported. The extractor engages approximately 17% more of a seated ammunition cartridge's rim as compared to the prior art AR15/M16 extractor. The result is an improved bolt and bolt carrier which provides for increased operational reliability.

An operating system for a firearm includes a body, configured to be mounted to a firearm, having an interior space, a front, and an opposed rear. A piston is carried within the interior space for reciprocation between a forward position toward the front and a rearward position toward the rear. A gas port is formed proximate to the front of the body, and an outlet is formed proximate to the rear of the body. First and second gases flank the piston. Those first and second gases are isolated from each other. The piston moves to the rearward position in response to expansion of the first gas, thereby imparting movement of the second gas through the outlet. The piston also moves to the forward position in response to contraction of the first gas, assisted by a spring.

An operating system for a firearm includes a body, configured to be mounted to a firearm, having an interior space, a front, and an opposed rear. A piston is carried within the interior space for reciprocation between a forward position toward the front and a rearward position toward the rear. A gas port is formed proximate to the front of the body, and an outlet is formed proximate to the rear of the body. First and second gases flank the piston. Those first and second gases are isolated from each other. The piston moves to the rearward position in response to expansion of the first gas, thereby imparting movement of the second gas through the outlet. The piston also moves to the forward position in response to contraction of the first gas, assisted by a spring.

A firearm using blowback action has a barrel which is movably mounted within a shroud which is fixedly mounted on the firearm's frame. A gas space is formed between the barrel and the shroud by a difference between the inner diameter of the shroud and the outer diameter of the barrel. At least one gas port provides fluid communication between the bore of the barrel and the gas space. During firing of a cartridge, pressurized gas in the gas space applies a force to the barrel which moves relatively to the shroud away from the muzzle end of the firearm to engage a slide or bolt, helping to move it out of battery and extract the spent cartridge casing. Gas is vented to the atmosphere through a gas vent defined between the barrel and the shroud in fluid communication with the gas space.

A firearm using blowback action has a barrel which is movably mounted within a shroud which is fixedly mounted on the firearm's frame. A gas space is formed between the barrel and the shroud by a difference between the inner diameter of the shroud and the outer diameter of the barrel. At least one gas port provides fluid communication between the bore of the barrel and the gas space. During firing of a cartridge, pressurized gas in the gas space applies a force to the barrel which moves relatively to the shroud away from the muzzle end of the firearm to engage a slide or bolt, helping to move it out of battery and extract the spent cartridge casing. Gas is vented to the atmosphere through a gas vent defined between the barrel and the shroud in fluid communication with the gas space.

A firearm configured for disassembly into stock, and receiver and barrel assemblies. Stock-receiver and receiver-barrel mounting assemblies facilitate assembling and disassembling the firearm. Modified components are adapted for placement on standard firearms and enable expedited assembly and disassembly. A firearm assembly method is also disclosed.

A firearm configured for disassembly into stock, and receiver and barrel assemblies. Stock-receiver and receiver-barrel mounting assemblies facilitate assembling and disassembling the firearm. Modified components are adapted for placement on standard firearms and enable expedited assembly and disassembly. A firearm assembly method is also disclosed.

A firearm using blowback action has a barrel which is movably mounted within a shroud which is fixedly mounted on the firearm's frame. A gas space is formed between the barrel and the shroud by a difference between the inner diameter of the shroud and the outer diameter of the barrel. At least one gas port provides fluid communication between the bore of the barrel and the gas space. During firing of a cartridge, pressurized gas in the gas space applies a force to the barrel which moves relatively to the shroud away from the muzzle end of the firearm to engage a slide or bolt, helping to move it out of battery and extract the spent cartridge casing. Gas is vented to the atmosphere through a gas vent defined between the barrel and the shroud in fluid communication with the gas space.

A firearm using blowback action has a barrel which is movably mounted within a shroud which is fixedly mounted on the firearm's frame. A gas space is formed between the barrel and the shroud by a difference between the inner diameter of the shroud and the outer diameter of the barrel. At least one gas port provides fluid communication between the bore of the barrel and the gas space. During firing of a cartridge, pressurized gas in the gas space applies a force to the barrel which moves relatively to the shroud away from the muzzle end of the firearm to engage a slide or bolt, helping to move it out of battery and extract the spent cartridge casing. Gas is vented to the atmosphere through a gas vent defined between the barrel and the shroud in fluid communication with the gas space.