The Flash Hider-QD 556 is designed to mitigate flash when unsuppressed. Muzzle device length is 2.3 inches, length added to barrel is 1.7 inches (on barrels with 0.6" threads) The Flash Hider-QD 556 is compatible with HX-QD series (556k, 556, 762, 762 Ti and Magnum Ti) and FLOW series (556k and 762 Ti) suppressors. This flash hider is only compatible with VENTUM series suppressors when combined with the HUX HUB Adapter.