TacFire's Compact Compensator is constructed of steel with a heat treated, erosion resistant finish and helps reduce felt recoil and muzzle rise. It includes a crush washer. This 308 model has 5/8x24 tpi threads and a black nitride finish.Nitrided Compact Compensator is made of an all steel construction with a heat treated, erosion resistant black nitrided finish. It comes with a 308 5/8-24 thread pitch. Reduces recoil and barrel whip. USA made.