The gun is currently not working and won’t shoot. I’ve had the gun for a few years. The upper receiver is full metal. It used to make a grinding noise so I adjusted the motor height and was able to get it to shoot briefly but now it doesn’t shoot at all or make a grinding noise. I also know the gearbox is currently locked. Also needs a new selector switch. It will need some type of replacement part to fix the gun up. You pay shipping.