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. – Overall Length: 2.2 inches – Threads: 1/2 in-28 tpi – Weight: 3.2 oz – Material: Stainless Steel – Technology: Clutch-Lok QD – Type: Muzzle Brake – Barrel Interface: 25-degree taper – Caliber: 5.56 NATO