PTAC 16" Carbine Length 5.56 NATO 1/7 M4 Nitride Upper - w/ BCG & Charging Handle - 45240
Product Review (submitted on August 4, 2016):
I just ordered another complete upper, I ordered another one because of how accurate the first one was. The most accurate AR I own, that includes examples from S&W, Armalite, Bushmaster.
Also 100% reliable in about 1300 rounds. I am cheap, and shoot the cheapest ammo I can find. It just works with boring reliability.