MACHINE GUN Russian patent published in 2010 - IPC F41C7/00 F41A5/26 

FIELD: weapons.

SUBSTANCE: invention relates to small arms and represents a machine gun consisting of barrel, breech box, breech frame with bolt and piston, return spring and gas discharge assembly with horizontal gas chamber. Said gas chamber accommodates valve moving vertically. Valve top diametre-to-bottom diametre ratio makes at least 3:2. Said valve, in its top position, can shut off orifice made in gas chamber wall. Rotary circular sleeve is arranged all around gas chamber to release powder gases flowing out through gas chamber wall hole. Rotary drum is arranged along barrel axis, one face of said drum makes front wall of gas discharge tube. Distance between breech frame piston and gas chamber front wall makes not over 1/5 of complete stroke of recoiling breech frame.

EFFECT: possibility to adjust rate of fire and bullet muzzle velocity.

1 dwg