US PATENT SUBCLASS 89 / 192
.~.~ Gas piston compresses breech opening spring

Current as of: June, 1999
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89 /   HD   ORDNANCE

125  DF  AUTOMATIC {14}
191.01  DF  .~ Gas piston type {3}
192.~.~ Gas piston compresses breech opening spring

DEFINITION

Classification: 89/192

Guns under subclasses 191.01+ in which the exploding gases move a gas piston to compress a spring, which, after the gas drops to a predetermined value, unlocks and moves the breech block to open position.