Patent ID: 8272314

Claim:
A gas-operated, auto-loading firearm, comprising: a barrel fixed to a receiver; a trigger disposed in the receiver and biased to a forward position; a bolt carrier disposed in the receiver; a locking lever disposed between the trigger and the bolt carrier; a gas piston chamber and a gas piston slidably disposed in the gas piston chamber, the gas piston including a head and a rear surface, the rear surface having a protrusion thereon; a gas bleed line between the barrel and the gas piston chamber; a piston catch disposed in the receiver and having a downward bias; a spring-loaded detent disposed between the piston catch and the bolt carrier wherein, in a forward position of the bolt carrier, the spring-loaded detent provides an upward bias to the piston catch that overcomes the downward bias; a gas piston spring disposed between the gas piston head and a forward surface of the bolt carrier; and a return spring disposed between the rear surface of the gas piston and a surface of the receiver.