Forward Controls Design Muzzle Brake .30 Carbine 5/8x24 Nitride Black. 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 1210XE 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: 2.16 in Weight: 3.34 oz Package Contents: Forward Controls Design 1210XE Muzzle Brake Single use packet of Rocksett Forward Controls Design 1210XE: 1210XE Muzzle Brake .30 Carbine 5/8x24 Nitride Black