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; Fits Long Range and Varmint/Target models of X-Bolt Rifles; 2 Collars and Tool included