Plan B muzzle devices feature a taper followed by threads, resulting in repeatable lockup and a proper seal between the muzzle device and suppressor adapter. 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.Features :"Overall Length- 1.850";"Material- 17-4 Stainless"Finish- NitrideWeight- 2.2 oz"Milled rear flats for easy installation 13/16";"Timing not necessary"Engraved thread pitch for easy ID