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could be your BBs pressuring the air nozzle, I had that issue a while back where someone would hit the auto feed and the gun would lose FPS for the first few rounds
tappet plate may be sticky
could the ammo you're using
could be the hopup
could be a piston head seal problem
whens the last time you cleaned the barrel?
and is this a winter problem, or does it do this indoors?
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