Silencerco's 3-prong flash hider is compatible with the asr mounting system.It features a one hand on one hand off attachment/detachment and patent-pending resonance suppression which effectively eliminates the tuning-fork effect common with competing 3-prong flash hiders.The 3-port muzzle brake design effectively reduces felt recoil and muzzle climb.Finish: BlackType: Flash HiderModel: ASRSize: 9mmMaterial: SteelThread Pattern: 1/2"-28 tpi