US PATENT SUBCLASS 89 / 179
.~ Gas piston-type lock actuator carried by breech block (e.g., firing pin)

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89 /   HD   ORDNANCE

125  DF  AUTOMATIC {14}
179.~ Gas piston-type lock actuator carried by breech block (e.g., firing pin)

DEFINITION

Classification: 89/179

(under subclass 125) Guns in which the breech block is unlocked by a gas piston-type actuator carried by the breech block.

(1) Note. The actuator may be actuated by recoil of either the entire cartridge or the primer thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156, for guns having movable chambers serving as gas pistons.

183, for lock operating inertia members started by slight blow back of the entire breech block.