I discovered various versions when I seemed. Some were marked M-16A1, and some ended up marked M16A1. Some experienced SERIAL truly stamped on there ahead of the serial amount, and Other folks didn't. It has the early reciever without any fence around the mag launch and all early form release https://johnnytvtrp.salesmanwiki.com/9203718/5_easy_facts_about_colt_combat_elite_commander_45_acp_described