A muzzle brake can be indexed by turning it in a clockwise or counter-clockwise direction. In most cases, it is best to start with the brake in the 12 o’clock position and make small adjustments until you have achieved the desired effect. It’s usually done by using shims, a locknut, or a crush washer. Be sure to use a marker to indicate the original position of the brake before making any adjustments.
Andy Larsson Answered question September 24, 2022