The Faxon Muzzlok Plan B Flash Hider in 5/8×24 is a stainless flash hider with a .375-inch bore, built for repeatable timing (brand part no. FFMDPBFH02). Faxon Firearms machines it in the USA from 17-4 PH stainless (H1025) and finishes it in nitride. Its port geometry cuts visible muzzle flash, and the left-hand MuzzLok timing nut lets you index it without crush washers. The Plan B interface thread also accepts a Plan B to HUB adapter, so the same muzzle device can work with a 1.375-24 HUB-mount suppressor. It suits 5/8×24 barrels in .338 and smaller.

Key Specifications

• The muzzle thread is 5/8×24 UNEF, which sets the barrels this hider fits.
• The bore is .375 inch, sized for calibers .338 and smaller.
• The Plan B interface thread is 29/32-24 UNEF-2A, which mates to a 1.375-24 HUB through a Plan B to HUB adapter.
• The material is 17-4 PH stainless steel (H1025), chosen for durability and fit through repeated mounting cycles.
• The finish is nitride, which resists corrosion and wear.
• A left-hand timing nut locks the device in position, giving repeatable timing without crush washers.
• The package includes the flash hider, left-hand timing nut and installation instructions.

Frequently Asked Questions

How do I time this flash hider? Thread the flash hider and timing nut onto the barrel until they seat on the shoulder, back off to the position you want, then lock it with the left-hand timing nut. No crush washer is needed.

Does it work with HUB-mount suppressors? Faxon lists it for HUB-mount workflows through a Plan B to HUB adapter, including its Harmonix and CoreSync models when configured appropriately.

What is in the box? The flash hider, a left-hand timing nut and installation instructions.

Buy the Faxon Muzzlok Plan B Flash Hider, 5/8×24, .375-Inch Bore, Stainless

The Plan B system lets one muzzle thread serve a flash hider now and a HUB-mount suppressor adapter later. Browse more AR muzzle devices or order this flash hider from our Lubbock, Texas gun shop for fast shipping.