Product DescriptionThe Aero Precision M4E1 Stripped Lower Receiver combines billet-style aesthetics with the strength and value of a forged platform. Machined from 7075-T6 aluminum and finished in Flat Dark Earth Cerakote, this AR-15 lower receiver is built to mil-spec dimensions for broad compatibility with standard AR-15 components and magazines. The M4E1 design incorporates practical upgrades such as an integrated trigger guard, threaded bolt catch pin, upper tension screw, and increased magwell flare to support easier assembly and faster magazine changes. This stripped lower receiver includes a nylon tipped tensioning set screw and threaded bolt catch pin, but requires a lower parts kit, buffer, and stock to complete your build.Product Highlights Forged 7075-T6 aluminum construction offers a strong, durable foundation for AR-15 rifle builds. Flat Dark Earth Cerakote finish adds corrosion resistance and a distinctive tactical appearance. Integrated trigger guard increases rigidity and eliminates the risk of broken trigger guard tabs during assembly. Threaded bolt catch pin and threaded rear takedown pin detent recess simplify installation and help protect the finish. Upper tension screw and enhanced magwell flare improve receiver fit and support quicker magazine changes. Specs Product Type: Stripped lower receiver Model: M4E1 Platform: AR-15 Caliber: Multi-Caliber Material: 7075-T6 aluminum Construction: Forged Finish: Flat Dark Earth Cerakote Dimensions: Mil-spec dimensions Compatibility: Works with standard AR-15 components and magazines Included: Nylon tipped tensioning set screw, threaded bolt catch pin Weight: 8.61 oz Country of Manufacture: USA UPC: 815421022322 Manufacturer Part Number: APAR600002C Brand: Aero Precision Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.