5.56 NATO 16" 1-8 Twist Pencil Barrel with 3-Port Muzzle Brake - a precision muzzle brake chambered for 5.56 that redirects propellant gases to counter recoil and muzzle rise, keeping your sights on target for faster, flatter follow-up shots. Features: Reduces felt recoil and muzzle climb 3-Port design Verify thread pitch matches your barrel before installation