i bought the o-ring kit. the gun was removed from the job after it would auto shoot when plugged in and it seemed there was something sliding around i the gun holding it pointing up or pointing down before plugged in to air. soetimes when plugged in to air it would just leak out then replugged in sometimes it would seat" and hold pressure to allow use. i took it apart.. cleaned it . reinstalled it all teh o rings looked fine no scrathes or nothing but loads of oil and grime in teh inside of gun. it is still shooting a nail when plugged in . maybe i shoudl rebuild the trigger valve . this is my firs nail gun rebuild so any help is appreciated.