Quick view Yankee Hill Machine Yankee Hill 4445MB32 sRx Q.D. Muzzle Brake Short Black Phosphate Steel with 5/8"-32 tpi for sRx Adapters $91.69 $84.75 Yhms line of srx products were designed with aesthetics and ease-of-use as the top priorities, and that is no different for the yhm srx muzzle brake.This q.D.Muzzle brake is compatible q.D.Adapter/mounting interface attaches to the industry standard... Compare Add to Cart