FIELD: small arms. SUBSTANCE: gas chamber of underwater fire arm has barrel with bore connected with gas discharge hole to frame with gas space mounted on barrel where piston is installed. Gas space is made in the form of blind hole with annular groove close to bottom and hole in wall of frame where bushing with hole is mounted communicating gas space to space of annular groove. EFFECT: provision for automatic control of gas condition in chamber, simplified design, facilitated manufacture and ease of handling. 1 dwg
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