Multi-port design reduces felt recoil up to 76% (depending on caliber); Top and side ports direct gases to reduce muzzle rise; Closed bottom design helps reduce dust signature during firing; Rugged all-steel construction; Multi-caliber design that is suitable for rifles that are .30 caliber or smaller; Sporter Recoil Hawg will fit most sporter contour rifle barrels with an M13x1.25 or M13 .75 threaded muzzle; Sporter Recoil Hawg fits X-Bolt Speed and Sporter models of X-Bolt rifles