Brownells Brn Xm177e2 Upper Receiver 11.5in 1-7 Twist 1/2-28 Phosphate 5.56 Nato

The Brownells BRN XM177E2 Upper Receiver, 11.5", 1-7 twist, Black Phosphate finish, is a complete upper receiver designed for modern rifle builds that demand a lightweight profile and reliable performance, featuring a 1/2-28 muzzle thread and 5.56x45mm NATO compatibility for versatile shooting applications. This XM177E2 complete upper delivers a balance of compact length and proven twist rate, enabling accurate stabilization of a wide range of 5.56 rounds while maintaining smooth cycling and dependable feed in dynamic settings. With a lightweight contour and a durable phosphate finish, it stands up to field use, training, and competition scenarios, offering straightforward installation for builders seeking a ready-to-run upper that pairs well with compatible lower receivers and components. The compact 11.5-inch format suits close-quarters engagements, tactical drills, and sport shooting where maneuverability matters, yet the design preserves hardness, corrosion resistance, and long-term wear resistance essential for repeated sessions at the range. Whether upgrading an existing platform or assembling a new rifle, this upper delivers consistent performance, compatibility, and a clean aesthetic that complements a variety of black-finished builds.