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I'm going to take a stab at it and say check your wiring again. Was the gun wired to the front before you added the Crane stock? I am experiencing a similar problem with my ICS M4 and the problem lies in the motor height adjustment and the wiring I did to it. Maybe since I'm done school for a while I'll look into it more but the problem on mine is that it was wired to the front before and I rewired it to the back, but I must have put something together wrong because the motor height was messed up when I put it back together and now the motor has to be tightened all the way up for it to even try to pull the piston back and it does do it, but it sounds like crap. The problem on mine is for sure the wiring and reassembly I did to it.
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