ONE HORSE 5.56 NATO COMPLETE UPPER RECEIVER W/MID-LENGTH SOCOM BBL FOR AR-15 Upgrade your AR platform with a reliable 16" 5.56 NATO complete upper receiver built for accuracy, durability, and smooth operation. Designed as a ready-to-run solution, this upper is fully assembled and pins directly onto any mil-spec AR-15 lower for quick, hassle-free installation. At the core is a 16" barrel with a 1:8 twist rate, offering versatile performance and consistent accuracy across a wide range of bullet weights. The mid-length gas system provides smoother cycling and reduced recoil, improving overall shooting comfort and control. The 15" fr Mfg: One Horse