Knight's Armament QDC (Quick Disconnect Coupler) Flash Suppressors act as a quick detach mounting platform for a companion KAC QDC sound suppressor. Standing alone, the suppressors make excellent flash hiders, diffusing blast and minimizing flash signature. Machined from steel, these flash suppressors feature a matte black finish. Each flash suppressor includes a 7-piece shim kit and Rocksett adhesive for installation. Mfg: Knights Armament SPECS: Fits - 5/8-24 muzzle threads. Material - steel. Finish - Matte black. Includes 7-piece shim kit and Rocksett adhesive. 7.62 - Length - 3.06". Weight - 5.9oz. Thread - 5/8-24.