30SD muzzle devices provide high performance mounting option for Griffin QD Silencers as well as a 30 caliber interface for the QD Blast Shield. The Flash Comp , Flash Suppressor, and Muzzle Brake were made with the same performance features as their 5.56mm counterparts but with a 5/8x24 threaded interface and integral overtravel stops. An additional pin is pre-fit for pin and weld applications. CNC Machined and outside diameter ground from high strength, corrosion and wear resistant, 17-4 precipitation hardened stainless steel, the 30SD muzzle brake is black oxide finished.