Brn-15 Upper Receivers 5.56mm Nato - Brn-15 5.56mm 16'''' Bbl .750'''' Gas Block Upper Receiver

The Brownells BRN-15 5.56mm 16'' BBL .750'' gas block upper receiver is an assembled AR-15 upper designed in a Government contour with a 16-inch, 1-7 twist chrome-lined or treated bore for reliable 5.56x45mm NATO performance, a 1/2-28 muzzle thread, and a durable black anodized finish that resists wear in rugged field use. Built to integrate with standard AR-15 receivers, this upper delivers a streamlined platform ready for precision optics, mid-range steel challenges, or fast-action hunting rigs, where the balance of a mid-length gas system and a clean, consistent cyclic rate helps manage recoil and shot placement. The .750-inch gas block configuration contributes to smoother cycling across a wide range of loads, while the government-style contour preserves on-hand feel and balance for rapid target acquisition. Ideal for builders seeking a reliable, ready-to-install upper receiver assembly that pairs with existing lowers for rifle configurations in 5.56 NATO, this Brownells offering emphasizes compatibility, durability, and performance in adaptable patrol, range, or hunting scenarios.