The Rosco Manufacturing ROS-UPPER-BLK-004 Forged AR-15 Upper Receiver in aluminum combines durability and precision to support builders seeking a reliable foundation for a customized rifle. Featuring a forged 7075 T6 aluminum construction that is precision machined to mil-spec dimensions, this upper offers superb strength and lasting performance while ensuring maximum compatibility with mil-spec and aftermarket parts and accessories. The forward assist and port door are already installed, streamlining assembly and enabling confident cycling and access under real-world conditions. Designed to deliver a tight, reliable fit with a broad range of components, this upper enables you to configure your AR-15 exactly the way you want itfrom reliable range plinking to duty-ready buildswithout compromising fit or function. The combination of high-grade material, meticulous machining, and proven compatibility makes this upper a versatile choice for enthusiasts and professionals who demand consistency, repeatable performance, and strong overall value in their rifle platform. Whether upgrading an existing build or starting from a solid foundation, this Rosco piece is built to perform under demanding conditions.