Wound up with that upper and it's chrome bore barrel in the future. I believe It is really an A1E1 from some nomenclature I saw but not sure as I have in no way witnessed A further 1. I figured this was built within the time of product or service https://coltm16a1forsale45555.wikimeglio.com/9439010/top_guidelines_of_colt_combat_unit_rail_gun_45