bushing failure, stripped gears/ piston, etc... pretty much anything can happen but those are the common issues.
Just watch your full auto bursts. if you tend to unload full mags on one trigger pull, nothing in the mechbox will like you. not saying you can't do that, just not all the time. keep to shorter bursts or fewer long bursts and you'll be fine.
It's not often that I unload a full mag, but on occasion it's needed especially when someone isn't calling their hits.
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