The Battle Arms Development Workhorse AR-15 stripped lower receiver is built for dependable performance and versatile rifle builds. Forged from quality aerospace-grade 7075-T6 aluminum alloy, this lower receiver features a MIL-A-8625F Type III hard anodized flat black finish for durability and corrosion resistance. Designed for AR15, M16, and M4 platform compatibility, it works with TDP and mil-standard AR lower receiver parts while offering practical upgrades such as a broached magazine well, pictograph selector markings, multi-caliber marking, an easy-install set screw bolt catch pin, a captured takedown pin detent spring set screw, and an upper/lower receiver tension screw.Product Highlights Forged 7075-T6 aerospace-grade aluminum lower receiver for strong, lightweight AR-platform builds. Black Type III hard anodized finish built to MIL-A-8625F standards for enhanced wear and corrosion resistance. Compatible with TDP and mil-standard AR lower receiver parts for broad AR15, M16, and M4 build compatibility. Features a broached magazine well, multi-caliber marking, and pictograph selector markings for 90 degree or short throw safety selectors. Includes practical builder-focused details such as a set screw bolt catch pin, captured takedown pin detent spring set screw, and upper/lower receiver tension screw. Specs Product Type: Stripped lower receiver Platform Compatibility: AR15 / M16 / M4 Material: 7075-T6 aluminum alloy Finish: MIL-A-8625F Type III hard anodized flat black Magazine Well: Broached Selector Markings: Pictograph markings for 90 degree or short throw safety selectors Caliber Marking: Multi-caliber Bolt Catch Pin: Easy install set screw style, pin included Takedown Pin Detent Spring: Captured design with 4-40 set screw included Receiver Tension Screw: Included Weight: 8.22 oz Country of Manufacture: USA UPC: 810033783654 Manufacturer Part Number: WH556-LR-BLK Brand: BATTLE ARMS DEVELOPMENT Transfer Requirement: Federal Firearms License required 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.