Blackout Defense 1/2-28 Keymo Hybrid Muzze Device H900 Bronze. 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 14percent 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 Blackout Defense MUZZLE-1/2-KEYMO-HYB-H900: 1/2-28 Keymo Hybrid Muzze Device H900 Bronze