So let me get this right. The gun doesn't complete a full cycle but rather pulls the piston back but doesn't fire? Or the trigger is pulled but it doesn't make contact? I'm trying to make sense of this "there is some resistance and then it keeps compressing to it's stops". If you pull the trigger and nothing happens, even when the motor is out of the gun, then it could be that your switch assembly contacts is fried and has a built up of carbon.
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