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 were made with the same performance features as their 5.56mm counterparts but with a 5/8-24 threaded interface and integral overtravel stops. An additional pin is pre-fit for pin and weld applications. The gunsmith only needs to screw the muzzle device on and press the rear pin flush for pinning and welding. The 30SD muzzle brake is included with the 30SD silencer. 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. 5/8-24 threads offer compatibility with most 7.62mm firearms on the market. Features: Ambidextrous QD mount Free of wear prone geometry Functionally engineered for maximum performance Sacrificial baffle to extend the life of your suppressor 17-4 PH stainless steel to withstand hard use Griffin laser logo marked 5/8-24 industry standard thread pitch for most 7.62mm firearms Shim set included Integral over-travel stop pin Gate-Lok attachment system