Ruger 10/22 "muzzle brake compensator" (MBC) X22 The X22 slides over the muzzle and around the post sight. Although there isnt significant muzzle rise with 10/22, this will enhance accuracy by reducing muzzle flip for target shooting and hunting. And it looks so cool on. colours; 1) matt black 2) raw silver MBC model; X22 calibres .22LR, .22 magnum, .17 material; aluminium weight; 36gm overall length; 54mm top compensator ports; 6 vertical and 2 angled forward side brake ports; 3 larger each side included; 3 stainless steel grub screws and alen tool Designed and made in New Zealand Support NZ made. Please note: this fits most factory taper barrels, but as this MBC X22 is made with a tight tolerance, and due to the considerable tolerance variations at the muzzle from one factory to the next, in some cases it may be necessary to do some minimal fitting in order to get the correct push on fit on your barrel. + Thread version 1/2x20 and 1/2x28 "self timing" available in a week.