(5) Unlocking. The bolt is unlocked from the barrel socket.
(6) Extracting. The empty cartridge case is pulled from the chamber.
(7) Ejecting. The empty cartridge case is thrown from the receiver.
(8) Cocking. The sear engages the sear notch on the piston.
b. PROCEDURES. Start the cycle by putting the first round of the belt in the tray groove or inserting the magazine into the magazine well. Then pull the trigger, releasing the sear from the sear notch. When the trigger is pulled to the rear, the rear of the sear is lowered and disengaged from the sear notch. This allows the piston and bolt to be driven forward by the expansion of the operating rod spring. The cycle stops when the trigger is released and the sear again engages the sear notch on the piston.
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