Wound up with that upper and It is really chrome bore barrel in the future. I feel It is an A1E1 from some nomenclature I noticed but not sure as I have never found A further just one. I figured this was built across the time of product advancement for https://colt-combat-elite-defende90000.theideasblog.com/31705881/colt-m16a1-for-sale-things-to-know-before-you-buy