Screw the compensator about the barrel, Notice tighten the comp, then again off right until it can be sq. within the slide profile. Although not an entire checklist by any stretch with the imagination, Below are a few highlights of currently available compensators for a few popular rifles and pistols. https://92-series-muzzle-brake-129282.onzeblog.com/26907190/the-best-side-of-best-9mm-pistol-muzzle-brake-1-2x28