FIELD: small arms. SUBSTANCE: automatic firearms with drive from pressure of powder gases has barrel and coupling with gas cylinder put on it. Gas cylinder is positioned in parallel to barrel. It includes gas piston with return spring and its front part houses end-cap. Gas piston has head which diameter is smaller than inner diameter of cylinder, separated from main part of piston by means of annular groove. Gas exhaust duct arranged with displacement from butt of piston towards breach end of barrel and at acute angle to axis of bore facing breach end is formed in barrel, coupling and gas cylinder. Duct is brought out to ares of annular groove of piston. EFFECT: enhanced operational reliability. 1 dwg
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