Upgrade your AR platform with the Ruger 91003 AR Upper Receiver Assembly, a precision-engineered component designed for reliable performance in tactical and sporting applications. This factory-assembled upper delivers the quality and consistency Ruger is known for, providing a solid foundation for your custom build. Key Features Anodized Black Finish - Offers durable corrosion resistance and a professional appearance that withstands rigorous use. Factory-Installed Forward Assist - Ensures reliable bolt closure in demanding conditions, enhancing operational dependability. Factory-Installed Dust Cover - Protects the ejection port from debris while maintaining quick access when needed. 6061 Aluminum Construction - Provides an optimal balance of strength and reduced weight for comfortable handling during extended sessions. M4 Feed Ramps - Supports smooth cartridge feeding for improved reliability with a variety of ammunition types. Unmarked T-Marks - Allows for custom engraving or optics mounting without pre-existing markings. Specifications Receiver Material: 6061 Aluminum Finish: Anodized, Black Forward Assist: Factory Installed Port Door / Dust Cover: Factory Installed Feed Ramps: M4 T-Marks: Unmarked Weight: 10.72 oz Dimensions: 11.7 in (L) x 5.7 in (W) x 2.4 in (H) Why Choose This Product This upper receiver assembly solves common pain points for builders seeking a ready-to-install option that eliminates the need for separate sourcing of forward assist and dust cover components. The lightweight yet robust 6061 aluminum design reduces overall firearm weight without sacrificing durability, while the anodized finish resists wear from field use. Whether you're building a new rifle or upgrading an existing one, this assembly streamlines the process with proven Ruger engineering. Invest in a component that prioritizes fit, function, and longevity for your next project.