Alright I had a gear chip a while ago and I opened up the gearbox, cleaned everything off and wiped out the shell, and re-greased it and reassembled it all with a new gear set, but now I have another problem. When I shoot it the motor makes a scratching sound but it's not the same as when the motor isn't in far enough, it sounds like either the motor is stripped or there's something in there making the gears scratch, but nothing is moving. I tried tightening, loosening, and swapping out the motor for another, but nothing is helping. Could it have anything to do with the pistol grip? Any help would be much appreciated.