I Found numerous variations After i looked. Some were being marked M-16A1, and several ended up marked M16A1. Some experienced SERIAL in fact stamped on there ahead of the serial range, and Other folks didn't. Regrettably, I'm on travel so I am unable to write-up shots of your bolt. It's https://connerzazwt.digiblogbox.com/56359624/top-guidelines-of-colt-combat-unit-rail-gun-45