They are officially licensed and approved by Dead Air Silencers to incorporate their KeyMo mount design with their muzzle device designs. The KeyMo Hybrid is compatible with Dead Airs KeyMo-equipped silencers. Specifications for Blackout Defense Keymo Hybrid Muzze Device: Manufacturer: Blackout Defense Finish: Nitride Fabric/Material: 17-4 Stainless Steel Features of Blackout Defense Keymo Hybrid Muzze Device In-house heat treated to condition H900 for a through-hardness of 45-47 HRC 17-4 stainless steel that is heat treated to condition H900 exhibits 14% higher ultimate tensile strength over hardened 4140 steel Every 90 degree corner is machined with undercut profiles to improve seal and engagement with the suppressor 4 jet ports drilled at 51 degrees to direct gas forward and away from the shooter 2 jet ports at 12 oclock, 1 at 4 oclock and 1 at 8 oclock Recessed jet ports with a flat face to reduce carbon buildup on the device and improve ease of separation with a suppressor Forward-directed gas reduces muzzle rise, softens recoil, and pushes all explosive gasses away from the shooter Closed-prong design reduces flash and eliminates tuning-fork ping Package Contents: Blackout Defense Keymo Hybrid Muzze Device Shim kit