Hey guys. haven't been on in awhile. Recently I replaced my air nozzle. after putting all the pieces back together, I ran it for full auto for about 5 seconds. after that, grinding noise.
Opened it back up. Piston teeth got chewed right through. Was it the shimming that was the problem? cause I think a shim probably fell out during the process.
If you guys can help me it would keep me from going insane. anything else that went wrong that led to the piston grinding up?