Presma AR-10/LR-308 .308 Barrel Vise Block Rod with Torque Block for .936 Black. This multi-use tool helps with ease of installation of barrel nuts without scratching the exterior. Also a great way to securely hold your AR's upper receiver assembly for maintenance and upgrades. Now with newly added Torque Block for those really extra heavy duty jobs. These tools are made to grip in a bench vise so that the rod is either vertical or horizontal. You then slide the upper receiver onto the reaction bar. The splines on the front of the rod enter the into barrel extension for a secure hold and fit. Ready for tuning it's that simple. 12in in Length. Color anodized. Tips are 7075 Aluminum and base is 6061. Will handle 90+ ft lbs of torque. Specifications for Presma .308 Barrel Vise Block Rod w/ Torque Block for .936: Manufacturer: Presma Finish: Anodized Gun Model: AR-10 DPMS LR-308 Gun Type: Rifle Fabric/Material: 7075-T6 Aluminum 6061-T6 Aluminum Projectile Caliber: .308 Caliber Quantity: 1 Length: 12 in Package Contents: Presma .308 Barrel Vise Block Rod w/ Torque Block for .936 What firearm models does the manufacturer say Presma .308 Barrel Vise Block Rod w/ Torque Block for .936 is compatible with? The manufacturer suggests that Presma .308 Barrel Vise Block Rod w/ Torque Block for .936 is compatible with AR-10 DPMS LR-308Presma AV3-G2: AR-10/LR-308 .308 Barrel Vise Block Rod with Torque Block for .936 Black