Forward Controls Design Flash Hider 5/8x24 Nitride Black. Forward Controls Design is an authorized licensee of Dead Air suppressor mounts. Proudly designed and made in specialized factories. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 6310XE Flash Hider: Manufacturer: Forward Controls Design Color: Black Finish: Nitride Fabric/Material: 4140 Steel Threads per Inch: 5/8x24 Length: 2.157 in Weight: 3.55 oz Package Contents: Forward Controls Design 6310XE Flash Hider Single use packet of Rocksett Forward Controls Design 6310XE: 6310XE Flash Hider 5/8x24 Nitride Black