High Performance Muzzle Brake for Eliminating RecoilThe VG6 EPSILON 556 is our highest performing tactical muzzle device. The EPSILON 556 is a younger sibling the GAMMA series muzzle brake, but with an attitude that matches its larger size.Designed for the discriminating shooter and professional end-users, VG6 Precision's EPSILON 556 Tactical Brake is brings you the best recoil mitigation the industry has to offer. This is a true combination muzzle brake / compensator / flashhider. It is the only muzzle brake that can substantially reduce muzzle flash while retaining full recoil-reducing properties!SpecificationsMaterial : 17-4ph® Heat Treated Stainless SteelFinish : BLACKNITRIDE™ - Matte FinishSurface Hardness : 68RCCaliber : 5.56mm/ .223 Rem onlyThread : 1/2x28 RHInstallation : Crush Washer (included), Installation should be done by a qualified gunsmith.* Do not use with any other muzzle attachment devices like sound suppressor. Please use the EPSILON 556 alone.