KAK Industry Plan B A7 Flash Hider. These Plan B muzzle devices are compatible with Plan B suppressor hubs. It is recommended to use Rocksett for installation and 20-25 ft-lbs of torque. Some suppressor manufacturers will not honor warranty claims if other brands of muzzle devices are used with their suppressors. Specifications for KAK Industry Plan B A7 Flash Hider: Manufacturer: KAK Industry Color: Black Caliber: 7.62x51mm NATO Finish: Nitride Black Threads per Inch: 5/8x24 Additional Features: Flash Hider Case Finish: Nitride Handle Color: Black Blade Finish: Nitride Features of KAK Industry Plan B A7 Flash Hider: Overall Length- 1.850" Material- 17-4 Stainless" Package Contents: KAK Industry Plan B A7 Flash Hider