A compact silencer (suppressor) device for a firearm comprising of multiple chambers which trap the gases from a projectile exiting the barrel of a gun to slow down the gases and reduce the temperature, sound, and flash associated with the projectile. In one embodiment, the first chamber which attaches to the barrel of the firearm comprises of sound baffling materials or gas porting baffles which vent gases from the second chamber passing rearward. The second chamber comprises of a chamber which can accommodate a retractable third chamber of the device, the second and third chamber of the device can have sound baffles to slow down the gases from the projectile.

An integral sound suppressor for a gun barrel, with the integral sound suppressor including a tubular housing designed for nearly completely or completely encasing the gun barrel along its longitudinal direction with an internal thread disposed inside the housing for mounting the integral sound suppressor on an external thread disposed on the muzzle of the gun barrel. Disposed inside the housing is a deflector system for deflecting the gas generated by firearm discharge, and disposed on the housing is a guide surface which is spaced at a distance from the internal thread along the longitudinal direction of the housing for guiding the integral sound suppressor in the region of the front end of the gun barrel.

A compact silencer (suppressor) device for a firearm comprising of multiple chambers which trap the gases from a projectile exiting the barrel of a gun to slow down the gases and reduce the temperature, sound, and flash associated with the projectile. In one embodiment, the first chamber which attaches to the barrel of the firearm comprises of sound baffling materials or gas porting baffles which vent gases from the second chamber passing rearward. The second chamber comprises of a chamber which can accommodate a retractable third chamber of the device, the second and third chamber of the device can have sound baffles to slow down the gases from the projectile.

An auxiliary caliber weapon system that allows a conventional shotgun, such as a pump action shotgun or other firearm, including artillery weapons to be modified to fire ammunition rounds of a selectable caliber. The system includes a barrel assembly and to load an ammunition round within the shotgun or other firearm and a shotgun shell adapter of a selected auxiliary caliber is utilized. The shotgun includes a stock with grip a receiver and an internal magazine. The shotgun barrel is removed and the system's barrel assembly is attached to the shotgun, interfacing with the receiver. An ammunition round of a selected auxiliary caliber is inserted into the adapter, which is then placed into the magazine via a loading port. When the shotgun pump is actuated the adapter with the auxiliary caliber round is loaded from the magazine into the receiver, and is ready to be fired. After being fired, the pump is actuated again causing the adapter to be ejected out an ejection port and another adapter with an auxiliary caliber round to be loaded. For use with an artillery weapon, the adapter is scaled to a larger dimension to accommodate the larger size ammunition used but the functionality is the same.

An auxiliary caliber weapon system that allows a conventional shotgun, such as a pump action shotgun or other firearm, including artillery weapons to be modified to fire ammunition rounds of a selectable caliber. The system includes a barrel assembly and to load an ammunition round within the shotgun or other firearm and a shotgun shell adapter of a selected auxiliary caliber is utilized. The shotgun includes a stock with grip a receiver and an internal magazine. The shotgun barrel is removed and the system's barrel assembly is attached to the shotgun, interfacing with the receiver. An ammunition round of a selected auxiliary caliber is inserted into the adapter, which is then placed into the magazine via a loading port. When the shotgun pump is actuated the adapter with the auxiliary caliber round is loaded from the magazine into the receiver, and is ready to be fired. After being fired, the pump is actuated again causing the adapter to be ejected out an ejection port and another adapter with an auxiliary caliber round to be loaded. For use with an artillery weapon, the adapter is scaled to a larger dimension to accommodate the larger size ammunition used but the functionality is the same.

A semi-automatic pistol has a frame having a trigger guard defining a trigger finger space, a barrel connected to the frame and defining a bore axis, a slide connected to the frame and operable to reciprocate along the bore axis between a forward battery position and a rearward open position, a recoil mechanism operably connected between the slide and the frame, and operable to bias the slide to the battery position, and the recoil mechanism being entirely below the barrel axis and forward of the trigger finger space. The recoil mechanism may be a recoil spring defining a spring axis. The spring axis may be parallel to the bore axis. The recoil spring may be a helical shape defining a bore receiving a guide rod. The guide rod may be below the barrel. The trigger guard may have a downwardly facing upper surface defining the trigger finger space.

An upper receiver assembly for a firearm having an upper receiver with an integral barrel nut, a handguard assembly and a barrel nut assembly with a barrel and lock nut is provided. The barrel is received by the upper receiver and is secured directly to the upper receiver using the lock nut. The upper receiver also includes an integral handguard mounting member to which the handguard assembly may be directly attached. The upper receiver assembly allows the user to attach both the barrel and handguard assemblies directly to the upper receiver, independently of one another.

An upper receiver assembly for a firearm having an upper receiver with an integral barrel nut, a handguard assembly and a barrel nut assembly with a barrel and lock nut is provided. The barrel is received by the upper receiver and is secured directly to the upper receiver using the lock nut. The upper receiver also includes an integral handguard mounting member to which the handguard assembly may be directly attached. The upper receiver assembly allows the user to attach both the barrel and handguard assemblies directly to the upper receiver, independently of one another.

The present invention relates to a self-powered device for measuring a firing rate, comprising: a) a thermoelectric generator (2) that converts thermal energy into electrical energy; b) a system (3) that is able to determine the temperature of the barrel (7); c) a system for processing and recording said measurements (4); d) characterized in that the system for determining temperature (3) and the system for processing and recording measurements (4) are powered by the thermoelectric generator (2).

The present invention relates to a self-powered device for measuring a firing rate, comprising: a) a thermoelectric generator (2) that converts thermal energy into electrical energy; b) a system (3) that is able to determine the temperature of the barrel (7); c) a system for processing and recording said measurements (4); d) characterized in that the system for determining temperature (3) and the system for processing and recording measurements (4) are powered by the thermoelectric generator (2).