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. Available in 1/2-28 threads. 5.56 flash suppressor features a 3-prong design. Mfg: Knights Armament SPECS: Fits - 1/2-28 muzzle threads. Material - steel. Finish - Matte black. Includes 7-piece shim kit and Rocksett adhesive. 5.56 - Length - 2.15". Weight - 2.6oz. Threads - 1/2-28.