I have 2 vfc 416's and I love them. If you're buying new you shouldn't have a problem but if you buy used make sure its a 2nd gen. The first generation of vfc 416's had terrible internals. The piston and tappet plate were notorious for breaking and they didn't have a mosfet. The newer vfc 416's have much better internals and a mosfet now. I think I shot something close to 120,000 rounds before I stripped the stock piston. Tappet plate gave out at around 60,000 - 80,000.
APOModern did mention upgrading the motor and what I found was that the stock motor could sometimes half cycle and you'd have to un-jam via the old throw it in full auto for a moment and then its fixed. You may also find the battery drains a bit faster then normal because I think stock the gun comes with a speed motor but I could be wrong.
The only cheap and easy upgrade I'd recommend though is get a good inner barrel and r-hop it. If you don't know anyone that can r-hop a barrel then flat hopping is almost as good and easier to come by.
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