{HEAD ~ an unmodified selected caliber handgun} having a barrel receiving cavity with {TAIL ~ a mounting surface} for receiving a live ammunition firing barrel 
{ HEAD ~ an unmodified selected caliber handgun } having a barrel receiving cavity with { TAIL ~ a mounting surface } for receiving a live ammunition firing barrel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH