AUTOMATIC FIREARM Russian patent published in 1997 - IPC

FIELD: automatic firearm, mainly in aircraft and antiaircraft machine guns and cannons. SUBSTANCE: in automatic firearm, using a barrel, receiver, sliding breechblock with a gas-conducting duct from the charge chamber to the front end of the breechblock, two feed mechanisms separately for shells and charges, the automatics drive is made with a gas escape hole in the barrel side wall with a gas cylinder and gas piston linked with the barrel. The gas chamber is formed in the receiver with a charge port in the chamber rear wall. The breechblock is made of two interconnected parts, the front part is located before the charge chamber for feeding the shell into the bore; the rear part of the breechblock front part is located in the charge chamber for longitudinal movement in it. The gas- conducting duct is an axial nozzle in the breechblock front part, and the breechblock rear part is located behind the charge chamber for feeding the charge into the chamber. EFFECT: enhanced rate of fire and muzzle velocity. 2 cl, 2 dwg