Birchwood Casey Vise Block Features The Birchwood Casey Vise Block is engineered to clamp firmly into any standard bench vise giving the user a stable platform for cleaning assembly and barrel installation work on an AR-15 upper receiver. Its soft jaw design is a key feature since it prevents the hard aluminum jaws of a typical vise from marking or damaging the finish of the receiver. The block installs directly to the upper receiver holding it steady while the barrel nut is torqued down to the manufacturer s specification. Included snap pins secure the block to the receiver ensuring it will not shift or loosen under the torque applied during assembly. Designed for standard AR-15 and equivalent rifle platforms the vise block gives home builders and armorers a safer more controlled way to perform maintenance that would otherwise require awkward hand-holding of the upper. This reduces the risk of slipping tools or applying uneven pressure that could damage threads or the receiver itself. The gray finish is simple and functional matching the utilitarian purpose of a shop tool. Anyone building or servicing their own AR-15 uppers will find this vise block a worthwhile addition to their bench. Birchwood Casey Vise Block Specifications Manufacturer: Birchwood Casey Model: Vise Block Color: Gray Compatible Hosts: AR-15 and Equivalent Rifles Purpose: Cleaning / Assembly Includes: Snap Pins Available At: GrabAGun