The upper is actually a flat major, not surprisingly, and comes along with each of the typical Mil-Spec enjoyable things like a dust address and ahead support. Posted by Phil Herbert on twenty second Apr 2023 I’ve had a variety of Colt 9mm AR15s in the two pre-ban and write-up-ban https://colt105upper52962.diowebhost.com/81790150/a-review-of-colt-10-5-inch-9mm-smg-upper-receiver-assembly