KAK Industry Plan B Universal Muzzle Device 5.56x45mm NATO 1/2X28 Nitride Finish Black. These Plan B muzzle devices are compatible with Plan B suppressor mounts. 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 Universal Muzzle Device: Manufacturer: KAK Industry Color: Black Finish: Nitride Fabric/Material: 17-4 Stainless Steel Length: 1 in Weight: 1.6 oz Outer Diameter: 0.895 in Features of KAK Industry Plan B Universal Flash Hider Bore- Universal Milled flats for easy installation 13/16" Muzzle devices are engraved with respective thread pitch for easy identification Package Contents: KAK Industry Plan B Universal Flash Hider KAK Industry 410-2103-001: Plan B Universal Muzzle Device 5.56x45mm NATO 1/2X28 Nitride Finish Black