Product DescriptionThe Wheeler AR-15 Upper Receiver Lapping Tool helps ensure a precise, square mating surface between your upper receiver and barrel extension for improved accuracy. Designed to be used with a battery-powered or electric drill, this tool quickly trues the receiver face so the barrel nut can torque smoothly and align the gas tube correctly. Durable steel construction with a black oxide finish, a flexible driver shaft, and included 220-grit lapping compound make this a reliable addition to any AR-15 builder&';s bench.Product Highlights Squares AR-15 upper receiver face for optimal barrel alignment and accuracy Attaches to a drill for quick, consistent lapping results Durable steel construction with protective black oxide finish Flexible driver shaft for easier operation during lapping Includes 220-grit lapping compound to complete the job Specs Product Type: AR-15 upper receiver lapping tool Material/Finish: Steel with black oxide finish Operation: Use with a battery-powered or electric drill Included: Flexible driver shaft and 220-grit lapping compound Intended Use: Trues receiver face; aids gas tube and sight alignment; supports proper barrel nut torque UPC: 661120567578 MPN: 156757 Brand Name: Wheeler 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.