FIELD: automatic small arms, in particular, breechblock mechanisms of such a weapon. SUBSTANCE: the gas-return mechanism has a gas chamber that communicates with the bore, piston linked with the breechblock. The piston is installed on the barrel for relative motion catching it, and the gas chamber is made in the form of a piston. The piston may project behind the barrel muzzle end and has an expansion at the outlet end, directed towards the barrel muzzle end. EFFECT: simplified design of mechanism, reduced overall dimensions of it and enhanced efficiency of its operation. 3 cl, 3 dwg
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