Dead Air Armament KeyMicro Xeno Wee Brake Flash Hider 9mm 1/2-28 Black. Featuring a 9 MM bore size in all thread pitch variations. The Xeno Pistol Wee Brake was designed as a QD mounting option with the pistol caliber Sub-Guns in mind. Pair the Xeno Pistol Wee Brake with the appropriate Xeno Adapter to use on the Wolfman Ghost Primal Nomad Sierra 5 and many more. Specifications for Dead Air Armament KeyMicro Xeno Wee Brake Flash Hider: Manufacturer: Dead Air Silencers Color: Black Caliber: 9mm Luger Finish: Black Nitride Fabric/Material: 4140 HT Alloy Steel Package Contents: Dead Air Armament KeyMicro Xeno Wee Brake Flash Hider Dead Air Armament DA125: KeyMicro Xeno Wee Brake Flash Hider 9mm 1/2-28 Black