Wound up with that upper and it's chrome bore barrel down the road. I feel It truly is an A1E1 from some nomenclature I noticed but undecided as I have hardly ever viewed another 1. I figured this was manufactured across the time of merchandise advancement into the M16A2 ?. https://crossbookmark.com/story18396102/examine-this-report-on-colt-m16a1-for-sale