Arguably one of the most vital elements of the AR-15 is picking the right upper receiver group. After all, your upper provides the lock-up between the bolt and barrel, leaving you with either an accurate and dependable firearm or something that offers little more than consistent frustration.
If you want to build an AR for precision shooting, general use, or home defense/close-quarters combat, there’s an upper out there for you, but how do you go about picking the best one?
