TacFire Compact 308 Win Compensator 5/8"-24 tpi Black Nitride Steel 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. Model: Compact Material: Steel Thread Pattern: 5/8"-24 tpi Finish: Black Nitride