If you study in detail the manual on how to build a AR 15, then this model is already completely ready for installation on the lower receiver because it is assembled.
The manufacturer of this model is a reliable company that creates high-precision barrels that meet all modern military standards. If you think carefully about what is the best AR 15 for competition or professional long-range shooting, then this is an excellent choice in terms of price and quality in every detail. The barrel is finished with a slim 15" free float rail and A2 flash hider; the gas block is a .750 low-profile steel type. This modern and stylish AR 15 full upper assembly has a thin bar at the end (only 15") with free float and a system Type A2 flash suppressor. The upper receiver is flat-coated, and its material is certified 7075-T6 aluminum forgings. If you decide to purchase this unique barrel, it is important to remember that there is no BCG and Charging Handle in the kit. You will need to purchase this separately.