TOP GUIDELINES OF COLT COMBAT UNIT RAIL GUN 45

I discovered several variations Once i appeared. Some were marked M-16A1, and some had been marked M16A1. Some experienced SERIAL truly stamped on there before the serial variety, and Other folks didn't.    The "C" over the barrel would point out a chrome chamber only barrel. But AFAIK, Colt marked the "C" up near the muzzle on their own early ba