Faxon SLIM 3-Port Muzzle Brake Review – “Conventional” Lightweight AR15 Build

Faxon SLIM 3-Port Muzzle Brake Review – “Conventional” Lightweight AR15 Build Faxon .620″ SLIM 3 Port Muzzle Brake Gears rating Where to buy If you find the review below helpful and […]

Faxon SLIM 3-Port Muzzle Brake Review – “Conventional” Lightweight AR15 Build

Faxon .620″ SLIM 3 Port Muzzle Brake Gears rating

Gear Score
Gearswww.dyerware.comwww.dyerware.comwww.dyerware.comwww.dyerware.comwww.dyerware.com
Fit and finish on the Faxon .620 SLIM 3 Port Muzzle Brake is great. Functions as designed AND makes the gas systems on pinned and welded barrels serviceable. Brilliant!

Where to buy

If you find the review below helpful and think the Faxon .620″ SLIM 3 Port Muzzle Brake is right for you, then please consider supporting Gear Report by clicking this link when you are ready to get one of your own: Faxon .620″ SLIM 3 Port Muzzle Brake

Faxon SLIM 3-Port Muzzle Brake specs

.620″ SLIM 3 Port Muzzle Brake, Steel, QPQ Nitride

  • Material: Gun Barrel Quality Steel
  • Finish: QPQ Salt Bath Nitride
  • Thread: 1/2″-28 TPI
  • Weight: 1.12 Ounces
  • Length: 2.125 Inches
  • Diameter: .620”
  • Caliber: .223/5.56
  • MSRP $60.00

Faxon .620″ SLIM 3 Port Muzzle Brake review

What is the big deal with this small diameter muzzle brake? First you need to understand some of the more arbitrary and backwards US gun laws. To avoid creating an NFA regulated firearm and the absurd Form 1 process to get ATF’s permission to make a Short Barreled Rifle, one must be sure that a rifle’s barrel is at least 16″ long. Add another 2-2.5″ to the barrel length if you put a muzzle brake on the end, for a total of 18-18.5″. For many uses that length is just fine. However, some things are easier with a shorter overall rifle, like clearing houses, firing from vehicles, hunting in thick woods. The laws allows that if a muzzle device is pinned and welded in place so that it can not be removed, then it is considered part of the barrel. So, Faxon created a lightweight combination barrel and muzzle break that together makes the 16″ keeping it within the arbitrary legal 16″ minimum length.

How do you service the gas block?

Until now such a setup would not allow for the gas system to be installed or removed once the muzzle brake was pinned and welded to the end of the barrel. By making the outer diameter of the muzzle brake slightly smaller than the inner diameter of the gas block Faxon has solved this problem. With the Faxon .620″ SLIM 3 Port Muzzle Brake the gas block fits over the muzzle brake. So the gas block can be be serviced or changed on barrels with the SLIM 3 port muzzle brake pinned and welded in place. This is an ingenious design to help with a ridiculous situation created by an absurd law.

Faxon .620″ SLIM 3 Port Muzzle Brake Installation

Since we test a lot of silencers it made more sense for us to maintain the ability to unscrew the muzzle brake when we need to run the rifle with a can. For this particular build we affixed the Slim 3 port muzzle brake to a 16″ Faxon Pencil barrel (Match Series- 16″ Pencil, .223 Wylde, Mid-Length, 416R, Nitride, 5R, Nickel Teflon Extension) with the use of our handy adjustable wrench. It really was as simple as screwing it on and torquing it a bit until timed properly.

Faxon .620″ SLIM 3 Port Muzzle Brake Field testing results

In testing I noticed a difference in felt recoil with and without the muzzle brake installed. It was not as massive a difference as if a much larger brake were used. However, every little bit of recoil mitigation helps get back on target more quickly for follow-up shots.

Faxon .620″ SLIM 3 Port Muzzle Brake Accuracy

Our accuracy testing at 100 yards was done with 6 types of ammo. The accuracy target will be revealed in our overall rifle performance review, since I consider them result of all the parts. The barrel does have the biggest job and its performance is completely dependent on the manufacturing quality, but without the rest of the parts there wouldn’t be a chance to shoot through it.

Faxon .620″ SLIM 3 Port Muzzle Brake Gears rating

Gear Score
Gearswww.dyerware.comwww.dyerware.comwww.dyerware.comwww.dyerware.comwww.dyerware.com
Fit and finish on the Faxon .620 SLIM 3 Port Muzzle Brake is great. Functions as designed AND makes the gas systems on pinned and welded barrels serviceable. Brilliant!
Faxon Firearms ARAK 308 Jeff SHOT 2016 fireball

Check out the muzzle blast as Jeff shoots the ARAK in .308

Faxon Firearms – The bleeding edge

Faxon Firearms stems out of a machining company established in 1978. Faxon is more than just a gun company, with products for a wide range of industries like medical, machinery, automotive, even air and space.

Perhaps it is the broad reach into other industries that brings Faxon Firearms a different perspective that sometimes turns the industry on it’s head. For example, Faxon’s ARAK rifle brought a unique approach to delivering a modular, ambidextrous, multi caliber rifle solution. Faxon has also hovered around the leading edge of barrel design and manufacture offering creative external treatments like the “Flame fluted barrel” featured in our 2016 Gear Report custom AR15 (build link) and the Lightweight Pencil AR15 barrel featured in this build. In fact, Gear Report’s Editor spent some quality time with the big cheese himself, Bob Faxon, in October and got the scoop on their innovative line of Glock replacement barrels with tighter tolerances and a variety of performance and aesthetic improving coatings.

Faxon Firearms Glock barrels

*Editor’s note: Yeah… I know… This is an AR15 muzzle brake review. Why a big pic of Glock barrels? Because I think it is a cool picture. 🙂

Lightweight AR15 Review Project

With so many brands introducing light weight parts and rifles, we put together two AR15s that barely tip the scales. We call this series of reviews… the Lightweight AR Review Project.

The two rifles are:

  • “Conventional” Lightweight AR15 – mostly aluminum that has been aggressively lightened.
  • “Carbon fiber” Lightweight AR15 – combo of lightened aluminum and carbon fiber

This is our “Conventional” Lightweight Build

Each brand that sent parts for this build is featured in a separate article. This one is for Faxon Firearms.

Ammo for testing provided by

Without the support of our ammo suppliers we would not be able to do nearly the amount of gun reviews that we do today.

Defender Ammunition CompanyDefender Ammunition Company

Big thanks go to our primary Ammo Sponsor Defender Ammunition Company for supplying ammo for our tests and reviews on an ongoing basis. Defender provided a variety of calibers and types of ammo for this test. Gear-Report.com is a proud member of Team Defender

Sig Sauer

SIG provided .223 ammo for this test.

Gorilla Ammunition

Gorilla Ammo provided reman and factory .223 rifle rounds for this test.

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About Jeff

Jeff is the Editor in Chief of Gear Report and a National Shooting Sports Foundation Media member. He reports on the outdoor industry, reviews gear for camping, hiking, shooting, hunting, paddling, backpacking and other active pursuits. A USAF veteran, Jeff earned a MBA in Marketing and Health Services. He specializes in consultative selling and internet marketing. As the VP of BD & Marketing, Jeff provides sales and marketing leadership to MGECOM, Inc. and helps http://MGECOM.com acquire new clients in need of solutions for online merchants in need of Affiliate Marketing program management. Jeff founded and manages Cress Sales & Marketing LLC, offering online sales and marketing consulting and services to online merchants and service providers.