Product Description The Wheeler Delta Series AR-15 Upper Vise Block lets you securely clamp your AR-15 upper receiver in a bench vise without twisting, crushing, or marring the finish. Optimized for both left- and right-hand Mil-Spec A2 uppers with carry handles as well as modern flat-top receivers, this durable block is made from high-pressure, solvent-resistant polymer. It is ideal for torquing a barrel on, removing a stubborn barrel nut, or performing routine maintenance and cleaning. A receiver insert with a gas tube alignment system is included to keep the gas tube properly aligned when installing a barrel and torquing a barrel nut. Note: Does not work with left-handed uppers that have a dust cover that flips upward. Product Highlights Non-marring, high-pressure polymer construction resists common solvents Safely clamps AR-15 upper receivers without crushing or finish damage Includes receiver insert with gas tube alignment pin for proper assembly Fits left- and right-hand Mil-Spec A2 and flat-top AR-15 upper receivers Works with standard bench vises with at least 3-inch jaw opening Specs Brand: Wheeler Series/Model: Delta Series Upper Vise Block Compatibility: AR-15 upper receivers (Mil-Spec A2 and flat-top) Material: Solvent-resistant polymer Color/Finish: Black, matte Included: Receiver insert with gas tube alignment system Approximate Weight: 1.2 lb Dimensions (L x W x H): 13.7 x 7.1 x 1.8 in UPC: 661120564447 Manufacturer Part Number: 156444 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.