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I have several WE M4s with stock internals and they've fired 1000s of rounds each. One of the plastic bolt faces broke once, because of a BB that didn't clear out the ejection port when I cycled the gun manually.
Don't upgrade parts in it for nothing (or because "i hard that...") and do your research about stuff and they're fine. If you do start putting RA steel internals in, you need to do the whole gun or things DO break: the mix of steel and not steel parts does end up damaging the non-steel parts (hence don't upgrade for nothing).
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