ONE HORSE 5.56 NATO COMPLETE UPPER RECEIVER W/HBAR MID-LENGTH BBL FOR AR-15 Upgrade your rifle with a precision-driven 16" 5.56 NATO HBAR complete upper receiver built for durability, accuracy, and sustained performance. Engineered for shooters who demand consistency, this upper delivers enhanced stability and reliability in a ready-to-install package. At the core is a 16" HBAR (Heavy Barrel) profile designed for increased rigidity and improved heat management. The heavier barrel profile reduces flex during firing, helping maintain tighter shot groupings and consistent performance over extended shooting sessions. The 15" free-flo Mfg: One Horse