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are you using CO2 or propane? the M922A1's aren't made for CO2. I mess one up with CO2 at 600psi.
is it stuck or does it just not return all the way to firing position?
anyway, pull it apart and inspect it for flaws or damage. ensure you replace all the bearings and that they stay in place. when resetting, use something with a point that you can insert into the little hole and wiggle it a bit as the spring pushes it.
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