SilencerCo ASR Flash Hider 5/8x24 .30 Caliber Black. They offer one hand on one hand off attachment/detachment. The patent-pending resonance suppression 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. Specifications for SilencerCo ASR Flash Hider: Manufacturer: SilencerCo Color: Black Fabric/Material: Steel Additional Features: Resonance suppression compatible with ASR mounting system Included Accessories: Standard Condition: New Package Contents: SilencerCo ASR Flash Hider SilencerCo AC590: ASR Flash Hider 5/8x24 .30 Caliber Black