Flash Hider-QD is designed to mitigate flash with unsuppressed.
Flash Hider-QD 556 is compatible with HX-QD 556k, 556, 762, 762 Ti and Magnum Ti suppressors.
Flash Hider-QD 762 is compatible with HX-QD 762, 762 Ti and Magnum Ti suppressors.
NOTE: Larger caliber mounts are NOT compatible with smaller caliber suppressors. Smaller caliber mounts ARE compatible with larger caliber suppressors.