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My G&G M4 was doing something similar from almost new, it would fire short auto bursts in semi and a quick pull of the trigger in auto and it would continue to fire auto for 1-2 seconds AFTER the trigger was let go. I figured it was something sticky inside (cut off lever?). A short spritz of silicon spray up into the gearbox, from around the trigger, and everything worked fine afterward... go figure.
Marc.
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