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A fast and easy way to know if it's the tappet plate:
1: Turn the M4 upside down, with no mag inserted.
2: Make sure that the front of the M4 points in a safe direction.
3: Look carefully through the Hop-Up hole, get a flashlight if needed.
4: Cycle the gun in semi-auto.
4A: If you see the nozzle going forth and back when cycling, the tappet plate does its job.
4B: If you see the nozzle, and it doesn't move when you cycle the gun, then most likely the tappet plate or its spring are busted.
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