its the powder coat in the threads that are a nightmare ,,if you dont have old bb cups or anythingin the threads youl prob have to chase the threads or get the lbs to do it /fit the parts,,, make sure theres no blasting medium still left in the tubes before rebuilding ,,the blasters will blow it off sure but glass beads /sand /whatever in the bb or something is a thing to avoid obv ,,and it wont b like a hammerite gate lol,,,iv had a few things done and im constantly thinking its a good fin