Forward Controls Design Dead Air Keymo Muzzle Brake .30 Carbine 5/8x24 Nitride Black. Threaded for 5/8 x 24 1210KM is a Keymo compatible brake compatible with all Dead Air 30 caliber sound suppressors. Forward Controls Design is an authorized licensee of Dead Air suppressor mounts. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 1210KM Dead Air Keymo Muzzle Brake: Manufacturer: Forward Controls Design Color: Black Projectile Caliber: .30 Caliber Caliber: .30 Carbine Finish: Nitride Fabric/Material: 4140 Steel Threads per Inch: 5/8x24 Length: 2.402 in Weight: 3.46 oz Package Contents: Forward Controls Design 1210KM Dead Air Keymo Muzzle Brake Single use packet of Rocksett Forward Controls Design 1210KM: 1210KM Dead Air Keymo Muzzle Brake .30 Carbine 5/8x24 Nitride Black