The Faxon Firearms AR-15 pinned gas block 5.56x45 NATO rifle barrel in a 16-inch pencil profile with a durable black nitride finish delivers proven reliability and modern performance for AR-15 builds. Built around a mid-length gas system for smoother cycling and reduced muzzle impulse, this barrel features a 1-8 twist and a 1/2-28 muzzle thread pattern, making it compatible with a wide range of 5.56x45mm NATO ammunition and popular optics setups. The pencil contour preserves maneuverability and balance, while the pinned gas block ensures a secure, clean installation that maintains zero and rigidity under use. With a compact 16-inch length, this barrel pairs well with a variety of upper receivers for sport, target, or duty-style configurations, offering accurate shot placement at typical engagement distances and excellent velocity retention for longer-range plinking or silhouette shooting. Its black nitride finish provides corrosion resistance and easy maintenance, helping maintain a pristine appearance and consistent performance through extended field use. Whether upgrading an existing build or assembling a first-class AR-15 rifle, this Faxon barrel brings precision, durability, and dependable service to your platform.