The AR-15 muzzle device attaches to the threaded end of an AR-15 barrel and modifies the rifle’s muzzle characteristics. Common types include flash hiders, compensators, and muzzle brakes. Flash hiders reduce muzzle flash, compensators redirect gas to control muzzle rise, and muzzle brakes reduce felt recoil. AR-15 muzzle devices thread onto standard 1/2×28 threaded barrels and fit mil-spec upper receivers. Builders choose them to improve performance, control, and accuracy in tactical, competition, and recreational AR-15 builds.