Now you are talking about CA guns (in a G&P thread)? G&P Armalites break their tappets pretty early, is well documented on here actually. Am not familiar with any G&P made M249s though.
Ragarding the CA M249, yes, I dealt with one that has had about as many rounds through it as you mentioned that busted the tappet, but the owner insists on an over 400fps spring, so it's expected. Recently he's ripped two pistons to shit, even through just test firing.
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