PTS Dead Air Keymicro BrakeThe PTS Dead Air series of muzzle devices are fully compatible with our PTS Dead Air silencers with the PTS Keymo attachment such as the PTS Dead Air Sandman series of silencers and tracers. These multiple muzzle device styles will allow you to customize the appearance of any of your airsoft guns with 14mm CCW threaded barrels and allow you to use your PTS Dead Air mock suppressors and or tracers on multiple guns. They are manufactured from steel