Anybody know why my new AAC can screws down so far it jams against end of the slide on my Kimber Gold Match .45. Ed Brown barrel measures 5.522", but if I lock the slide back and turn the can another third of a thread until it stops, then release the slide and it strikes the can and fails to go into battery. Bought the short 1911 piston from AAC and found it was the exact one Chris supplied me with from Sportsworld. Is the Ed Brown barrel too short? Do I need a 5.75" threaded barrel?