I Found a number of versions Once i seemed. Some were marked M-16A1, and some have been marked M16A1. Some experienced SERIAL truly stamped on there ahead of the serial range, and Other people did not. It's got the early reciever without having fence throughout the mag release and all https://colt-combat-unit-rail-gun56777.blogolize.com/colt-combat-elite-commander-45-acp-for-dummies-70524823