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.Finish: Black OxideModel: 30SDMaterial: 17-4 Stainless SteelThread Pattern: 5/8"-24 tpi