Brownells BRN-16A4 Upper 5.56 NATO 20in Government Contour Anodized AR-15

The BRN-16A4 5.56x45 NATO 20'' BBL UPPER RECEIVER from Brownells offers a complete AR-15 upper assembly crafted in a black anodized finish with a Government contour and a 20-inch barrel that features a 1-7 twist and a 1/2-28 muzzle thread, delivering reliable accuracy and compatibility with standard AR-15 platforms. This complete upper receiver combines performance and straightforward integration, enabling shooters to upgrade or build a rifle with unmatched consistency for target shooting, varmint control, or patrol-ready setups. The 5.56x45mm NATO chambering provides versatile performance across a wide range of ammunition, while the anodized black finish protects against wear in demanding field or range environments. Its clean, corrosion-resistant profile, paired with a precisely machined upper receiver and standard AR-15 fit, ensures smooth cycling and reliable chambering when paired with compatible lowers and handguards. The 20-inch configuration optimizes velocity and effective range for precision shots, enabling consistent groups at distance and improved terminal dynamics. Ideal for rifle enthusiasts and professional operators alike, this Brownells BRN-16A4 upper receiver is a dependable foundation for a high-performance AR-15 build.