(under subclass 125) Devices having a gas- operated cylinder device, the movement of which operates the extracting and reloading mechanism of an automatic ordnance device.
(1) Note. Blow back guns (no breech lock) are excluded from this and indented subclasses.
(2) Note. To cause original classification herein the claims must be directed to the structure of the gas port, cylinder or piston, and/or the connection with the breech block lock and must not include and specific breech block lock.
(3) Note. Usually the gas piston unlocks the breech block lock, but in some guns it serves to retard blow back of the breech block.
SEE OR SEARCH THIS CLASS, SUBCLASS:
156, for movable chambers operating as gas pistons.
159, for combined movable barrel and gas operated guns.
179, for gas pistons carried by the breech block. 180+, for gas piston-type guns where the claims include a breech block lock.
