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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FAXON .620" SLIM 3 PORT MUZZLE BRAKE
Installs easily. Looks great on the riffle. You don't need to take off the muzzle break to remove the gas blosk
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Impressed
Quality is fantastic and this is the only MD I can find on the interwebs that can be pinned and welded on a pencil profile that allows the gas block to be removed. Faxon innovation at its finest.
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Nice Muzzle Brake- A Must for Pencil Barrel Rifles
There have been a number of times where I wished I could remove a gas block without having to also remove the muzzle brake. With this slim brake, that’s a reality. I love Faxon’s pencil profile barrels. They look nice, are super light and most important, they’re great shooting barrels. The problem with it, though, is that any standard muzzle tends to look really silly, not unlike that skinny kid in elementary school whose head was far too big for that stick-like body of his. The slim 3 port brake from Faxon is the answer. It gives my rifle a sleek, clean look while taming recoil. Yes, 5.56 recoil isn’t massive, but reducing recoil = better shooting. I highly recommend this design.
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Flash Hider
It's a great thing to be able to put a rifle on a diet plan. Great for lady shooters.
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3 port slim muzzle brake
Great muzzle brake.
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Perfect!
Perfect match to a pencil profile barrel
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Perfect for removing gas port.
I purchased this muzzle brake so I could still remove my barrel nut and gas port after pinning it. Super slim profile allows just that.
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Perfect for removing gas port.
I purchased this muzzle brake so I could still remove my barrel nut and gas port after pinning it. Super slim profile allows just that.
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Slim line muzzle break
Very well made and super nice finish. Awesome price compared to competitors non slim line breaks to get you to 16” with the added benefit of being able to still get the gas block on and off after installed. Highly recommend this product.