FAXON SLIM .620" 3-PORT 5.56 STEEL MUZZLE BRAKE - NITRIDE
Faxon
$59.99
Faxon SLIM .620" 3-Port 5.56 Muzzle Brake – Nitride
Category: Rifle Parts
Platform: Multi
Series: Muzzle Devices
Caliber/Cartridge: 5.56 NATO / .223
SKU: FFMD556S63PSQPQ | UPC: 816341022331
MSRP: $60.00
The Faxon SLIM .620" 3-Port 5.56 Muzzle Brake was built to solve a real-world problem for legal firearms owners: once you permanently attach (pin & weld) a muzzle device to hit the minimum legal barrel length, you’re often locked into a specific gas block, barrel nut, and handguard setup. The SLIM series changes that.
With its .620" outside diameter, the SLIM is engineered so that gas blocks and barrel nuts can pass over the muzzle device. That means you can permanently attach the brake and still maintain flexibility for future component changes or service—without being boxed into one configuration.
Performance-wise, the three-port design redirects gas to reduce recoil and muzzle rise for faster follow-up shots and improved control. It’s precision-machined from gun barrel quality steel and finished in QPQ (salt bath) nitride for excellent corrosion resistance and durability.
Product Specifications
- Material: Gun Barrel Quality Steel
- Finish: QPQ Salt Bath Nitride
- Thread Pitch: 1/2"-28 TPI
- Caliber: .223 / 5.56 NATO
- Weight: 1.12 oz
- Length: 2.125 in
- Outside Diameter: .620"
- SLIM Profile: Designed so many gas blocks and barrel nuts can fit over the device
Why Choose the SLIM Series?
- Pin & weld friendly profile for long-term build flexibility
- Gas blocks and barrel nuts fit over the muzzle device more easily than traditional brakes
- 3-port design helps reduce recoil and muzzle rise
- Durable QPQ nitride finish for corrosion and wear resistance
Fitment note: Always confirm your specific gas block and barrel nut dimensions before pinning/welding. Component dimensions vary by manufacturer.
Frequently Asked Questions
What does “SLIM .620"” mean?
It refers to the muzzle brake’s outside diameter (.620"). The SLIM series was designed so many gas blocks and barrel nuts can pass over the device, which is especially valuable for pin & weld builds.
Is this muzzle brake good for pin & weld builds?
Yes. The SLIM profile is purpose-built to keep build/service flexibility after permanent attachment—just confirm your specific component dimensions.
What thread pitch does this brake use?
Standard 1/2"-28 TPI, commonly used on .223/5.56 AR barrels.
What finish is on this muzzle brake?
QPQ (salt bath) nitride for corrosion resistance, surface hardness, and long wear life.
Warranty
Faxon Firearms products are backed by our Lifetime Guarantee to the original purchaser against defects in materials and workmanship. For full terms, exclusions, and RMA instructions, visit: Faxon Warranty Policy.
Warranty: Faxon Firearms products are backed by our Lifetime Guarantee to the original purchaser against defects in materials and workmanship. Warranty service requires an RMA and proof of purchase. Full terms, exclusions, and instructions:
https://faxonfirearms.com/warranty-privacy-terms/
Reviews
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My new favorite brake
Love everything about the brake, weight ,design and profile. Only thing that would make it better would be pre drilled for a pin.
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The answer for your 14.5” build
Simple but brilliant concept - works as advertised, allows you to service or change gas blocks, barrels, hand guards etc. once pinned and welded to stay legal on your 14.5” builds - and still very effective at eliminating muzzle rise. I’m very pleased with the outcome and piece of mind on serviceability - highly recommend.
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Faxon Muzzle Break
This is a fine addition to my build. I have a few of these, no complaints. I attached it to a 16" Gunner barrel because it is so lightweight. It looks good and works as it should.
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Slim muzzle brake
Good muzzle brake at a good price point. This is intended for those that have to pin the muzzle brake on the barrel, but I would suggest this muzzle brake for those looking to preserve lightweight builds as well. Heavier muzzle brakes can upset the balance of the barrel especially on follow-up shots. This brake does it's job. With an adjustable block and a gunner barrel I have no significant recoil or muzzle flip.
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FAXON .620" SLIM 3 Port Muzzle Brake, Steel, QPQ Nitride
Look nice on the barrel. Sweet for compliance states like Ma. that requires the break to be welded and pinned on any length barrel. Only complaint I have is the flats on it were hard to find a wrench that would fit, and I ended up having to use a adjustable. Would buy again if I have a barrel I might want to switch out handguards or gas blocks on.
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Great Muzzel Brake
I am pleased as usual with the quality of the product. I initially tried to order on the first run which was advertised as being pre drilled for pinning. I submitted the option to be notified when back in stock. The only disappointment I have in the muzzle brake is that it was not pre drilled. I do now remember seeing a memo that only the first run would be pre drilled, but it would only make sense that a .620 muzzle brake is only going to be sought after by those wanting to permanitly pin and weld a muzzle brake on a 14.5" barrel so they could change the gas block in the future. It would be my recommendation that they all be pre drilled.