Primary Weapons Systems Muzzle Device & Alignment Shim Set for 1/2×28

Primary Weapons Systems Muzzle Device & Alignment Shim Set for 1/2×28 A replacement 10-piece shim kit for your 1/2×28 threaded weapons New muzzle brakes normally supplied with the necessary washers, nuts, or shims; however sometimes replacement washers are needed if one is damaged or if installing a muzzle device on a different gun. Just install the necessary combination of shims to get the precise alignment you need. Each shim set ships with: 1 of Shim 1 (largest) QTY 8 of Shim 2 (medium) QTY 1 of Shim 3 (smallest) The large shim can be used to give the installer one half of a rotation or as a spacer for barrels that do not have relief cuts behind the threads. Shim 2 is used in varying quantities to achieve the proper alignment of your muzzle device. This shim gives the installer approximately 45 degrees of rotation. If needed, Shim 3 can be used where smaller degrees of rotation are needed for proper alignment.