Breechblocks for firearms, the breechblocks including a barrel axis and a barrel extension, including a bolt with cam pin and cam pin axis, and a bolt carrier which has at least one end face and an assembly groove and a substantially S-shaped cam slot with a locked position and an unlocked position, wherein the assembly groove at the locked position of the cam slot is subsequently formed substantially from behind in the forward barrel direction and is essentially U-shaped.

A recoil assembly for a rifle includes a barrel assembly, a bolt, bolt actuator, and a buffer assembly. The barrel assembly includes a barrel secured to a barrel extension. The barrel assembly is configured to be movably received through the fore end of a receiver and to move axially relative to the upper receiver when the rifle is fired. The barrel extension is coupled to a hydraulic buffer assembly located below the barrel extension and counteracts recoil forces acting on the barrel extension when the rifle is fired. An op-rod spring is coupled to an op rod extending from a gas piston assembly on the barrel. The op-rod spring counteracts recoil forces acting the bolt actuator when the rifle is fired.

A rifle with an auto-loading mechanism having a gas chamber with a guiding tube connected to a gas adapter, and a piston assembly including an impact damper, a piston slidingly movable within the gas chamber, a guide fixed to the piston at one end and provided at its other end with a blind hole, a fixed piston slidingly movable at one end within the blind hole of the guide and fixed to the impact damper at the other end, a helical spring arranged within the blind hole of the guide and a return helical spring arranged around the guide in a way to lean against a stop in the guiding sleeve with one end and against the impact damper with the other end, wherein the gas chamber is arranged on the rifle barrel in the area of the barrel receiver. The advantage of the rifle lies in that it allows for more accurate shooting, has lower weight and less recoils.

A rifle with an auto-loading mechanism having a gas chamber with a guiding tube connected to a gas adapter, and a piston assembly including an impact damper, a piston slidingly movable within the gas chamber, a guide fixed to the piston at one end and provided at its other end with a blind hole, a fixed piston slidingly movable at one end within the blind hole of the guide and fixed to the impact damper at the other end, a helical spring arranged within the blind hole of the guide and a return helical spring arranged around the guide in a way to lean against a stop in the guiding sleeve with one end and against the impact damper with the other end, wherein the gas chamber is arranged on the rifle barrel in the area of the barrel receiver. The advantage of the rifle lies in that it allows for more accurate shooting, has lower weight and less recoils.

A gun has parts that slide past one another during operation. A coating is formed on at least a surface of a first part that contacts a second part. At least an upper layer of the coating is porous and comprises a thermoset polymer and a filler. One or both parts may be part of a gas-operated reloading mechanism. The coating prevents jamming by excluding particles, yielding to particles that still manage to intrude, and by providing a reservoir for lubricant. The coating reduces clearances, improves accuracy, and reduces operating temperatures. The coating excludes particles from the lubricant, effectively allowing a large volume of lubricant to be used without the drawback of trapping dirt and other contaminants in the lubricant.

An improved gas impingement system including an upper receiver incorporating a barrel. A gas block is secured to a forward location of the barrel and includes a rearward extending portion shrouding a forward portion of a gas tube connected to the gas block. The gas tube is in communication with a gas port defined in the gas block extending to an interior of the barrel. The gas tube extends rearwardly from the gas block and communicates at a rear end with a key of a bolt carrier positioned within a firing chamber of the upper receiver. Upon discharging a ballistic from a cartridge contained within the chamber, pressurized gas resulting from the discharge is diverted through the gas port, gas block, and gas tube to the key, causing the bolt carrier to move rearward, with the rearward extending portion of the gas block both structurally supporting the gas tube and externally sinking heat from the gas tube.

An improved gas impingement system including an upper receiver incorporating a barrel. A gas block is secured to a forward location of the barrel and includes a rearward extending portion shrouding a forward portion of a gas tube connected to the gas block. The gas tube is in communication with a gas port defined in the gas block extending to an interior of the barrel. The gas tube extends rearwardly from the gas block and communicates at a rear end with a key of a bolt carrier positioned within a firing chamber of the upper receiver. Upon discharging a ballistic from a cartridge contained within the chamber, pressurized gas resulting from the discharge is diverted through the gas port, gas block, and gas tube to the key, causing the bolt carrier to move rearward, with the rearward extending portion of the gas block both structurally supporting the gas tube and externally sinking heat from the gas tube.

A recoil assembly for a rifle includes a barrel assembly, a bolt, bolt actuator, and a buffer assembly. The barrel assembly includes a barrel secured to a barrel extension. The barrel assembly is slidably received in the receiver and the barrel extension is coupled to a hydraulic buffer assembly located below the barrel extension. The hydraulic buffer assembly is configured and arranged to arrest rearward movement of the barrel assembly when the rifle is fired. An op-rod spring is coupled to an op rod extending that can be actuated by a gas piston assembly on the barrel. The op-rod spring is configured and arranged to arrest rearward movement of the bolt assembly.

A pistol caliber blowback operated bolt carrier group is provided with an integrated gas key. The carrier group providing a bolt carrier having elongated generally cylindrical body and a gas key integrally formed into a top portion of the body

A pistol caliber blowback operated bolt carrier group is provided with an integrated gas key. The carrier group providing a bolt carrier having elongated generally cylindrical body and a gas key integrally formed into a top portion of the body