PRI Quiet Control Muzzle Brake 5/8"-24 Thread AR-15 6.8mm Remington SPC Stainless Steel

The QCB has been cut from solid stainless steel bar stock for greater resistance to heat and burnout. The thread end of the brake tapers down to a .750" diameter. The brake comes with a selection of spacer shims to set the timing of the brake. The 3 holes should be at the 1 O'clock position when tightened into place. Tighten the brake into place using a round screw driver in the 1st slot closest to the barrel.