If you still have the electronic safety (the metal plate on the selector), it can short on the body.
That coupled with a pinched wire can make your gun shoot on it's own.
A dead MOSFET will also burn shorted (closed) and will cause the gun to enter a full-auto madness.
As for your piston, it looks like the plastic around the metal teeth bent a bit/have some play and allowed the gear to skip on the plastic tooth.
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Originally Posted by Drake
Damnit, don't make me add "no discussing temporal paradoxes" to the rules or I'll go back in time and ban you last week.
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