Ruger, 28500, AR-15 Stripped Lower Receiver, Black Features The Ruger AR-15 Stripped Lower Receiver is machined from high-strength 7075-T6 forged aluminum to strict mil-spec tolerances, providing a rock-solid foundation for any custom AR-15 build. It features a broached magwell for smooth magazine insertion, full-cut fire control group inlet, and a Type 3 hardcoat anodized black finish for maximum durability and corrosion resistance. A unique adjustable tension screw allows you to eliminate play between the upper and lower receivers for a tighter, more precise fit. Multi-caliber marked and ready for 5.56 NATO / .223 Remington and compatible calibers, this stripped lower is perfect for builders seeking genuine Ruger quality and reliability. Specifications Manufacturer: Ruger Model: AR Lower Receiver Material: 7075-T6 Forged Aluminum Finish: Type 3 Hardcoat Anodized Black Caliber: Multi-Caliber (5.56 NATO / .223 Remington compatible) Action: Semi-Automatic Stripped Lower Magwell: Broached Fire Control Inlet: Fully Cut Tension Screw: Adjustable Receiver Tension Compatibility: Standard AR-15 / AR-10 pattern uppers (with proper components) Why the Ruger Stripped Lower Receiver? Customers love the Ruger stripped lower for its premium forged 7075-T6 construction and mil-spec precision that ensures a rock-solid, high-quality AR-15 build every time. The adjustable tension screw provides a custom-tight fit between upper and lower, while the broached magwell and full fire control cuts make assembly smooth and professional. Builders appreciate the durable black anodized finish and Ruger's reputation for reliability in this essential foundation piece. Order your Ruger AR-15 Stripped Lower Receiver today at Battlehawk Armory for genuine Ruger quality, competitive pricing, and fast shipping to start your next custom build!