MSTN QC Brake 5.56MM (223)
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The 5.56 MSTN Quiet Control Brake / Compensator has a system of ports to reduce the felt recoil and the climb of the muzzle and to the right.
The QCB has been cut from solid stainless steel bar stock for greater resistance to heat and burnout. Specs: 304 Stainless .95" dia. X 2.05" long. Black Nitrite finish thread is 1/2"-28 The area over the threaded 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 brake into place using a round screw driver in the 1st slot closest to the barrel.
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