Otis Technologies Pro+ AR-15 Lock Block - Upper Receiver Vise Block The Otis Technologies Pro+ AR-15 Lock Block is a professional-grade gunsmithing tool engineered to make the removal and installation of barrels and hand guards faster and more precise, while also giving you the leverage needed to tackle stubborn, stuck barrel nuts. When secured in a standard bench vise, this lock block engages the barrel extension directly, preventing twisting and minimizing the risk of marring your upper receiver. By applying torque to the barrel extension rather than the aluminum upper, the tool provides a stronger and more secure hold for even the most demanding work. A included bronze bushing accommodates slight internal dimension variations found across the AR market, making this tool compatible with most AR-15 platforms beyond strict milspec. Constructed from 1018 steel and finished with a manganese phosphate coating, the Pro+ AR-15 Lock Block is built to withstand heavy use and stand up to years of reliable service. Product Highlights Locks into the barrel extension to securely hold AR-15 upper receivers in a standard bench vise, preventing twisting and marring Transfers torque directly to the barrel extension rather than the aluminum upper for a stronger, more precise hold Bronze bushing accommodates most AR-15 platforms, including those with slightly smaller internal specs than milspec Compatible with most standard table or bench vises for versatile gunsmithing use Crafted from durable 1018 steel with a manganese phosphate finish for long-lasting corrosion resistance and wear protection Specs Brand: Otis Technologies Model: Pro+ AR-15 Lock Block Compatible Firearm: AR-15 (Milspec and most standard receivers) Material: 1018 Steel Finish: Manganese Phosphate Color: Black Bushing Material: Bronze Item Height: 13.0 in Item Length: 1.5 in Item Width: 1.5 in Weight: 1.6 lbs Quantity: 1 UPC: 014895012918 MPN: OTSFGARLB 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.