Faxon Firearms Muzzlok Plan B Muzzle Brakes .375 Bore 5/8x24 Black. The Faxon MuzzLok Plan B Compatible Stainless Steel Muzzle Brake combines premium materials precise machining and a left-hand locking nut to deliver repeatable timing superior recoil management and Plan B ? Hub-Mount suppressor compatibility for Faxon CORESYNC and HARMONIX suppressors. Specifications for Faxon Firearms Muzzlok Plan B Muzzle Brakes: Manufacturer: Faxon Firearms Color: Black Finish: Stainless Steel Included Accessories: Standard Features of Faxon Firearms Muzzlok Plan B Muzzle Brakes Muzzle Thread: 5/8x24 (fits most .308-class barrels) Plan B Interface Thread: 29/32-24 UNEF-2A (mates to 1.375-24 HUB via Plan B ? HUB adapter) Bore: .375& (recommended for .338 and smaller) Material: 17-4 PH Stainless Steel (H1025 heat treat for strength & corrosion resistance) Mounting System: MuzzLok Plan B left-hand timing nut no crush washers or shims required Suppressor Compatibility: Works with Plan B ? Hub-Mount adapters for hub-mount suppressors like Faxon HARMONIX & CORESYNC Performance: Reduces felt recoil and muzzle rise while helping maintain POI Includes: Muzzle Brake left-hand timing nut installation instructions Package Contents: Faxon Firearms Muzzlok Plan B Muzzle Brakes Left-Hand Timing Nut Faxon Firearms FF-MD-PB-BRAKE-02: Muzzlok Plan B Muzzle Brakes .375 Bore 5/8x24 Black