Product DescriptionThe Aero Precision M4E1 Stripped Lower Receiver in Olive Drab Green anodized finish delivers billet-style aesthetics in a forged package for AR15 builders who want strength, compatibility, and easier assembly. Machined from 7075-T6 forged aluminum, this lower receiver is designed to work with standard mil-spec AR15 components and magazines while incorporating thoughtful upgrades that simplify the build process. Key enhancements include a threaded bolt catch roll pin, integrated trigger guard, upper tension screw, threaded takedown pin detent recess, and an increased magwell flare for faster magazine changes. This lower is also marked and milled to accept short-throw safety selectors while remaining compatible with standard selectors. Please note that colored anodized finishes may vary cosmetically and are held to different aesthetic standards than black anodized or Cerakote finishes.Product Highlights Machined from durable 7075-T6 forged aluminum for a strong and lightweight AR15 foundation. Threaded bolt catch roll pin helps simplify installation and reduce the chance of finish damage during assembly. Integrated trigger guard creates a stronger, more rigid lower receiver design. Upper tension screw allows fine tuning between upper and lower receivers for a tighter fit. Flared magwell and threaded takedown pin detent recess support quicker reloads and easier at-home builds. Specs Product Type: Stripped lower receiver Platform: AR15 Material: 7075-T6 forged aluminum Finish: Olive Drab Green anodized Compatibility: Standard AR15 components and magazines Markings: "Cal Multi", "M4-" serial number designation Weight: 8.61 oz Other Features: Rear takedown pin detent hole threaded for a 4-40 set screw; threaded bolt catch roll pin included Shipping to FFL Dealer Required: Yes FFL SOT Shipping Required: No Country of Manufacture: USA UPC: 840014618262 MPN: AERAPAR600501C 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.