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sounds like a compression problem
if im not correct, the M1A1 has a 3/4 ported cylinder. might be worth seeing if its blocked.
when you fire it, does it push out air? like alot? Its rare, but your piston head's o-ring might be dammaged to the effect that it will seal on the pull back but not the forward push.
If its still pushing air, check to see how the loading nozzel cycles if at all. Im sure the V6 works somewhat the same to V2 and V3 in terms of cycling the tappet plate and nozzel. making sure its timing is correct and that little sping that pulls it forward is still attached might be worth checking.
and if that works fine, turn your hop-up all the way off, spray in some silicone lube and try again.
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