I Found various variants Once i looked. Some have been marked M-16A1, and many have been marked M16A1. Some experienced SERIAL truly stamped on there ahead of the serial range, and Other folks didn't. Indeed, I'm sure the higher receiver is Colt, along with the BCG. It is admittedly the https://coltcombatunitrailgun4555550.bloggactivo.com/30673027/not-known-facts-about-colt-combat-unit-rail-gun-45