HUXWRX QD Flash Hider 5.56 1/2x28 Black. Flash Hider is compatible with 556k 556 762 762 Ti and Magnum Ti suppressors. (Regular) Muzzle device length is 2.3 inches and length added to barrel is 1.7 inches. (Long) Muzzle device length is 2.7 inches and length added to barrel is 2.1 inches. on barrels with 0.6 inch threads. NOTE: Larger caliber mounts are NOT compatible with smaller caliber suppressors. Smaller caliber mounts ARE compatible with larger caliber suppressors. Specifications for HUXWRX QD Flash Hider: Manufacturer: HUXWRX Color: Black Fabric/Material: Titanium Condition: New Package Contents: HUXWRX QD Flash Hider HUXWRX 1677: QD Flash Hider 5.56 1/2x28 Black