Dead Air Armament KeyMicro Flash Hider 9mm 1/2-28 Black. Designed for use with Their KeyMicro Adapter it functions as a minimalist flash hider on its own. Pair them together for the ultimate mounting platform. This is the same technology found in their industry-best KeyMo system. Specifications for Dead Air Armament KeyMicro Flash Hider: Manufacturer: Dead Air Silencers Color: Black Caliber: 9mm Luger Finish: Black Nitride Fabric/Material: 4140 HT Alloy Steel Barrel Material: 4140 Steel Length: 2.063 in Condition: New Package Contents: Dead Air Armament KeyMicro Flash Hider Dead Air Armament DA115: KeyMicro Flash Hider 9mm 1/2-28 Black