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FAXON DUTY SERIES GUNNER PROFILE 7.5" PISTOL-LENGTH 300 BLK AR15 BARREL
Faxon
$155.00
(4 reviews)
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Faxon
FAXON DUTY SERIES GUNNER PROFILE 7.5" PISTOL-LENGTH 300 BLK AR15 BARREL
Faxon Duty Series — 7.5" Gunner 300 BLK AR-15 Barrel (Pistol-Length Gas)
4150 CMV • Button Rifled • Gunner Lightweight Profile • Nitride Inside & Out • MPI & Headspace Checked
The Faxon Duty Series 7.5" Gunner 300 BLK delivers reliable performance in a compact package. Our Gunner profile blends Gov’t durability behind the gas block with a lighter forward section to reduce front-end weight, speed transitions, and keep your build balanced.
Machined in-house from 4150 CMV, button rifled in a versatile 1:8 twist, and salt bath nitride treated inside & out for corrosion and wear resistance. Every Duty barrel is stress relieved, air-gauge tested, magnetic particle inspected, and individually headspace verified for safety and consistency.
Key Benefits
- Gunner profile: Ideal balance—sturdy behind the gas block with weight savings up front.
- Pistol-length gas: Tuned for 300 BLK cycling, including common subsonic and suppressed setups.
- 4150 CMV + Nitride: Hard-wearing steel with black nitride inside & out for longevity.
- 1:8 twist: Stabilizes a wide range of 300 BLK bullet weights.
- Rigorous QC: Stress relieved, air-gauge tested, MPI, and headspace checked in-house.
Specifications
Frequently Asked Questions
Will this cycle subsonic ammo?
Pistol-length gas is optimal for 300 BLK. Subsonic reliability depends on ammo choice and setup; many users pair this barrel with an adjustable gas block and a suppressor.
What muzzle devices fit?
Standard 5/8x24 devices for .30 cal (.308/300 BLK) work, including brakes, flash hiders, and most suppressor mounts rated for 300 BLK.
Do I need an adjustable gas block?
Not required, but recommended for tuning across subsonic/supersonic and suppressed/unsuppressed configurations.
Overview: 7.5" Duty Series Gunner 300 Blackout Barrel
The Faxon Duty Series 7.5" Gunner 300 BLK is purpose-built for compact AR-15 builds where reliability and balance matter. Its Gunner profile keeps strength where it counts—behind the gas block—while trimming forward weight for quick target-to-target transitions. With 4150 CMV steel, button rifling, and a 1:8 twist, this barrel supports common 300 BLK projectiles from light supersonic to heavy subsonic loads.
Finished in salt bath nitride inside and out, the barrel resists wear and corrosion and cleans easily after high round counts. Every Faxon Duty barrel is stress relieved, air-gauge tested, magnetic particle inspected, and individually headspace checked before leaving our Cincinnati facility. The pistol-length gas system, .750" journal, and 5/8x24 muzzle threads integrate seamlessly with today’s .30-caliber devices and suppressor mounts—making this 7.5" 300 BLK an exceptional foundation for a compact defensive, training, or range build.
- Barrel Material:
- 4150 CMV
- Barrel Type:
- Button Rifled
- Caliber:
- 300 BLK
- Barrel Twist:
- 1:8
- Barrel Length:
- 7.5"
- Barrel Profile:
- Gunner
- Barrel Gas System:
- Pistol
- Outside Finish:
- QPQ Nitride
- Muzzle Thread:
- 5/8x24
- Gas Block Diameter:
- .750"
- Gas Block Journal Length:
- 1.9"
- Barrel Extension:
- M4
- Barrel Weight:
- .87 lbs
- Crown Type:
- Recessed 11-degree Target Crown
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Reviews
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Quality and Reliable
Finally got to the range and put my new build to the test. I chose this barrel due to others recommendation and price point for what I was trying to achieve with my build. The quality is great and so far has been very reliable. Groups of less than 2 MOA with various rounds out to 100yds. Couldn't be more pleased with the product.
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Accurate light and affordable
I absolutely love this barrel. It is 1 moa accurate with subs and supers. Is lighter weight than many other brands and half the cost. Is the perfect length for a 7” hand guard. Only the muzzle device is exposed..
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Love this barrel!
I have been so happy with the quality of this barrel that I boughy a 8.6 8” and am buying a 6” match 300 blkout barrel soon for another build for my wife. A super short super light backpack pistol! No expense spared for the lightest and best parts I can find.
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Great
I wish I could post a photo of the first groups. Fantastic high quality barrel. It out performs “match” barrels from other manufacturers.