Primary Weapons Ar-15 .223 Shim Set

Hardened steel shims ensure precise fit and correct alignment of flash suppressors, muzzle brakes, and compensators. Large (thick) shim allows 90deg of rotation and can be used as a spacer for barrels not having a relief cut behind the threads. Medium shims add approximately 45deg of rotation. Small shims used with large and medium shims provide smaller degrees of rotation for finely-tuned, critical alignment. Mfg: Primary Weapons SPECS: Steel. Sold in 10 paks (1 small, 1 large, 8 medium). .223 – .748" O.D. Fits muzzles threaded 1/2"-28 tpi.