The KeyMicro Flash Hider is a short, lightweight flash hider suited for a variety of platforms. Designed for use with Dead Air's 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 Dead Air's industry-best KeyMo system. The KeyMicro muzzle devices are also compatible with their KeyMo Adapter.KeyMicro muzzle devices feature a 9mm Bore.