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Faxon Firearms 300 Gunner Rifle Barrel
As Low As $128.34 Save Up to 22%
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Most Helpful Positive Review To the review that gave it 2 stars cause it wouldn't cycle subsonic ammunition
Ok if you don't know anything about .300 blackout maybe you shouldn't even be building one until you do some research . . First off , the gas port most likely isn't too small. You will rarely find a 300 bo that will reliable cycle subsonic ammunition WITHOUT a suppressor or at least a good krink sty...
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Most Helpful Negative Review Warning bad business
I heard some of their 300 barrels had gas port issues (to small) I contacted the company (they are local) who said it was a known issue that has recently been corrected. They further stated if I placed an order and received an older version to bring it by and they will fix it in about 5 minutes. N...
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Lighter than the one that came with it.

by kwik, Verified Owner from CO, United States Written on October 29, 2025
No, I haven't shot it yet; still building with this barrel. Got an amazing deal on an upper, I thought. Not impressed with how much it weighed thou. Wanted a light and maneuverable build, so ordered this barrel. Stout enough to shoot many mags through, and not spreading the MOA all over. From past experience, this should fit the bill. Goes to show it wasn't the deal I thought I was getting.
Best Used for:
  • 200 yards and closer
Would recommend: Yes
Was it helpful to you? Yes | No

My first complete build 300 BLK Gunner barrel and it is excellent

by DLeeO, from KS, United States Written on August 14, 2025
I did a ton of research before putting together my first component build. I'm not schooled enough for literally building one from the "screws up". Combining this barrel w a high quality adjustable gas block has resulted in a really reliable pistol configuration in .300 BLK sub, with a Silencerco 30 cal suppressor - Chimera, 36M, Velos LBP and new 46M Hybrid - I've used them all on this build and now the Chimera stays on it in my safe and on the range.
Haven't had any cycling issues once I set the gas adjustment right. I try to use the same ammo on the range always, but sometimes different ammo needs a slight gas adjustment. This is a bit lighter weight barrel too, and my goal was to build the lightest unit possible, from the trigger, hand guard, brace, grip and more, I couldn't be happier with this Faxon barrel.
I have 2 more now in other sizes & calibers for other builds. Once I find something that I really like (like Silencerco), I stick with and trust buying other items from the MFG.

Great barrels!
Pros:
  • Lightweight
  • Affordable
  • Accruate
Cons:
  • None
Best Used for:
  • lightweight suppressed build
Would recommend: Yes
Was it helpful to you? Yes | No

Exactly what I was looking for

by Buck, Verified Owner from KY, United States Written on May 3, 2025
Nice fit and finnish, no issues feeding or running any ammo, great product and I will buy from them again
Would recommend: Yes
Was it helpful to you? Yes | No

Top quality

by Moody27, Verified Owner from IN, United States Written on March 9, 2025
Faxon makes too quality barrels. 5r rifling and some of the top notch performance that you can expect out of a match grade barrel. High recommended
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No

Good size for pistol

by Jason, Verified Owner from NH, United States Written on February 3, 2025
Good fit and finish. Good thermo-fit in Aero precision upper.
Pros:
  • good fit in reciever
Cons:
  • Pricey
Best Used for:
  • Pistol / SBR
Would recommend: Yes
Was it helpful to you? Yes | No

Great Barrels

by Steve, Verified Owner from MN, United States Written on January 25, 2025
Faxon makes great barrels. Have used them on builds in multiple calibers. High quality and accurate.
Would recommend: Yes
Was it helpful to you? Yes | No

Great barrel!

by Range Day, Verified Owner from ID, United States Written on November 12, 2024
I love the product and have never been disappointed by the stuff I fet here!
Would recommend: Yes
Was it helpful to you? Yes | No

great barrel

by Demetrius, Verified Owner from NC, United States Written on October 27, 2024
Finish was amazing and nice feed ramps. Solved my 300 blackout issues
Would recommend: Yes
Was it helpful to you? Yes | No

great for the money

by Maurie, Verified Owner from NH, United States Written on June 26, 2024
Well made, nice snug fit and very accurate, great deal for the money
Would recommend: Yes
Was it helpful to you? Yes | No

Words for your eyes and mind

by Why is nickname required, from OR, United States Written on March 10, 2024
I like this barrel it is seemingly of high quality it works well I like the gunner profile mix of socom and pencil I like everything about it its loaded with features not normally found in and is a quality well above its cost bracket.
Pros:
  • Profile features weight quality everything about it
Cons:
  • I guess if it came with a free sundae would be pretty sweet
Best Used for:
  • 300 Blackout
Would recommend: Yes
Was it helpful to you? Yes | No
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