FIELD: arms. SUBSTANCE: gas-extraction engine with gas extraction from barrel muzzle end has muzzle cap 3, gas vent and gas cylinder 7 with piston 8. The gas vent is made as duct 4 in muzzle cap 3 and gas tube 6 connecting duct 4 in muzzle cap 3 to gas cylinder 7. Muzzle cap 3 is provided with gas lock 5 having cut-out a installed for turning and locking duct 4; and gas cylinder 7 with piston 8 is shifted towards bore breech end 1 over the length of gas tube 6. EFFECT: improved design. 1 dwg
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