This Clutch-Lok QD mount doubles as a muzzle brake for our 5.56MM SLH/SLX suppressors. It offers a quick and simple attachment of your suppressor and less felt recoil when the suppressor is removed. Shoulder interface: 25-degree taper for use with SIG SAUER Taper-Lok barrels. A quick way to install or remove your SIG SAUER suppressor while getting the benefits of less felt recoil when the suppressor is removed with this muzzle brake.