Mine fell apart at basically every point it could, with very little use.
It quickly killed my love of M14s.
The tappet plate, selector switch assembly, air nozzle, cylinder head, and hop-up all broke, with no reason. Yes, I probably got a lemon, and the AGM seems to have less lemons than the other M14 manufacturers, but it kinda soured me on M14s.
I would say get the CYMA M14, as it seems to be the best clone M14 out currently.