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. – Barrel Interface: 90-degree taper for use with non-SIG SAUER barrels. – Overall Length: 2.1 inches – Threads: 1/2 in-28 tpi – Weight: 3.2 oz – Material: Stainless Steel – Technology: Clutch-Lok QD – Type: Muzzle Brake – Barrel Interface: 90-degree shoulder – Caliber: 5.56 NATO