Faxon Muzzlok Stainless Steel Plan B Muzzle Brake | 5/8×24 | .375″ Bore

The Faxon MuzzLok stainless steel Plan B muzzle brake in 5/8×24 with a .375 inch bore is engineered for shooters who want superior recoil reduction and quick suppressor attachment from one device. Built entirely in the USA, this precision crafted brake features the patented MuzzLok system for effortless installation and reliable alignment. It is designed for .30 caliber and 6.5mm AR platforms, including .308 WIN, 300 BLK, 6.5 Creedmoor, and 6.5 Grendel.

Muzzle device installation has always involved shims, crush washers, and a certain amount of swearing. MuzzLok is the answer to that.

How the Faxon MuzzLok Stainless Steel System Works

Faxon’s MuzzLok technology eliminates the need for shims, timing tools, or crush washers. The locking collar design allows precise orientation and secure torque retention by hand, which means you can index the brake exactly where you want it and lock it there without a bench full of specialty tools.

Once locked, the brake maintains its timing and suppressor alignment even after repeated use, ensuring dependable zero retention and ease of maintenance. That is the part that matters for suppressor owners. A brake that shifts timing is a brake that eventually sends a baffle strike downrange, and repeatable alignment is what prevents it.

Key Features

• Patented MuzzLok system that eliminates shims, timing tools, and crush washers entirely.
• Locking collar design allowing precise orientation and secure torque retention by hand.
• Maintains timing and suppressor alignment after repeated installation and removal.
• Plan B suppressor compatible design for fast mounting when you want the can on.
• Stainless steel construction for strength and corrosion resistance at the muzzle.
• Built entirely in the USA with 5/8×24 threading and a .375 inch bore.

Thread Pitch, Bore Size, and Material

Thread pitch and bore diameter are the two numbers that determine whether this device fits your rifle. A 5/8×24 thread is the standard for .30 caliber AR barrels, and the .375 inch bore gives adequate clearance for .30 caliber and 6.5mm projectiles. That combination makes it a fit for .308 WIN, 300 BLK, 6.5 Creedmoor, and 6.5 Grendel builds. Measure your barrel threads before ordering rather than assuming, because a mismatched thread pitch is the single most common ordering mistake with muzzle devices.

Material choice is not incidental. The Faxon MuzzLok stainless steel construction handles the erosive, high temperature environment directly at the muzzle better than many alternatives, and stainless resists the corrosion that carbon and moisture inflict on a device that never gets truly clean. Products from Faxon tend to be built with this kind of practical durability in mind.

Installation, Suppressor Use, and Care

Installation is the easiest part of the whole process. Clear the rifle, clean the barrel threads, thread the brake on, index it to the orientation you want, and lock the collar down. There are no crush washers to compress, no shims to stack, and no timing to calculate, which removes most of the ways this job usually goes wrong.

If you are running a suppressor, verify alignment before firing. Use an alignment rod through the can and the bore to confirm concentricity, check that the mounting interface is fully seated, and inspect the interface periodically after that. The Faxon MuzzLok stainless steel brake is designed to hold its alignment through repeated cycles, but verification is cheap insurance against an expensive mistake.

Cleaning is straightforward but should not be skipped. Carbon builds fast on any muzzle device, so soak and brush the brake during normal cleaning sessions and pay attention to the locking collar threads and the suppressor mounting surfaces. Keep those surfaces free of heavy carbon so the collar continues to lock and release the way it should. A brake that is cleaned regularly stays easy to remove, and a brake that is neglected eventually becomes a project. Compare brakes, adapters, and barrels in our parts and upgrades collection. Ships direct to your door, no FFL required.