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FAXON DUTY SERIES GUNNER PROFILE 13.9" MID-LENGTH 5.56 NATO AR15 BARREL
Faxon
$170.00
(5 reviews)
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Faxon
FAXON DUTY SERIES GUNNER PROFILE 13.9" MID-LENGTH 5.56 NATO AR15 BARREL
Faxon Duty Series Gunner Profile — 13.9" Mid-Length 5.56 NATO (1:8 Twist)
Balanced, pin-weld-ready barrel optimized for accuracy, control, and long-term durability.
The Faxon Duty Series 13.9" Gunner Profile 5.56 NATO barrel represents the perfect balance of weight, performance, and reliability for modern AR-15 builds. By blending the strength of the Government profile with the agility of the Pencil contour, the Gunner design keeps the rifle fast and controllable while maintaining rigidity where it matters. At 13.9", this barrel is ideal for pin-and-weld setups that achieve a 16" legal length once a muzzle device is permanently attached.
Key Benefits
- Balanced Gunner contour: Combines Government durability behind the gas block with Pencil-like weight savings toward the muzzle.
- Pin-and-weld ready: 13.9" length is ideal for permanent muzzle device attachment to reach 16" OAL.
- Mid-length gas system: Offers smoother cycling and lower recoil impulse — excellent for suppressed or unsuppressed use.
- Built for performance: Fully stress relieved, air-gauge tested, magnetic particle inspected, and finished with an 11° target crown.
- Durable materials: Machined from 4150 CMV steel, button-rifled, and black nitride finished inside and out for longevity and corrosion resistance.
- Lightweight yet rigid: Only ~1.26 lbs, improving handling without compromising precision.
Specifications
Why Choose the Gunner Profile
The Gunner profile shifts the rifle’s center of gravity rearward, reducing front-end fatigue and enhancing control during sustained strings of fire. Faxon’s design merges the durability of a Government profile with the agility of a Pencil contour — the result is a barrel that handles faster, shoots flatter, and stays accurate under heat.
Installation & Compatibility
- Fits standard AR-15 uppers and bolts via M4 barrel extension.
- Use a .625" gas block on the 1.9" journal; adjustable gas blocks are recommended for suppressed setups.
- 1/2-28 muzzle threads accept common brakes, comps, and direct-thread suppressors — perfect for pin-and-weld builds.
- Pair with a mid-length gas tube and tuned buffer system for best reliability and recoil impulse.
Frequently Asked Questions
Is the 13.9" barrel good for pin-and-weld builds?
Yes — with most muzzle devices, pin-and-weld installation reaches the 16" legal minimum for non-NFA rifles.
What gas block size fits?
A .625" gas block fits the 1.9" journal perfectly. Adjustable options pair well for suppressed or tuned builds.
Is this barrel chrome-lined?
No — it uses a durable black nitride finish inside and out for superior wear and corrosion resistance.
What ammo works best?
The 1:8 twist stabilizes 55–77 grain 5.56 loads, ideal for general-purpose, duty, and precision applications.
Overview: Lightweight, Mid-Length 13.9" Gunner Barrel
The Faxon Duty Series 13.9" Gunner Profile Barrel is engineered for shooters seeking an optimized balance between compact size, reliable mid-length cycling, and full-length performance. Its hybrid contour keeps the weight down to around 1.26 lbs while retaining the rigidity required for sustained accuracy and heat control. The result is a barrel that’s fast, stable, and suppressor-friendly.
Each barrel starts as certified 4150 CMV steel, button-rifled with a 1:8 twist for versatile projectile stabilization. It’s then stress-relieved, air-gauge tested, and magnetic particle inspected before receiving a black nitride finish both inside and out for long-term corrosion resistance. The 11° target crown and precision headspace checks ensure consistent performance shot after shot.
Perfect for pin-and-weld rifles or lightweight carbines, the 13.9" mid-length Gunner profile delivers the smooth recoil impulse and extended gas dwell favored by modern shooters — ideal for both duty and recreational builds. It’s a trusted, duty-grade foundation for your next AR-15 project.
- Caliber:
- 5.56 NATO
- Barrel Profile:
- Gunner
- Barrel Material:
- 4150 CMV
- Rifling Twist Rate:
- 1:8
- Muzzle Thread:
- 1/2x28
- Gas Block Diameter:
- .625"
- Gas System Length:
- Mid
- Barrel Length:
- 13.9"
- Outside Finish:
- QPQ Nitride
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Reviews
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13.9" gunner 5.56 barrel
Great barrel! This is my 2nd 5.56 barrel from Faxon, the other is a 16" that rings steel at 500 yards all day long. This 13.9 barrel is on more of a duty style rifle and performs very well. The gunner profile gives great weight distribution, and I consistently get just over 1moa with mid grade ammo
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13.9” Gunner
I pinned and welded a muzzle device to this for my flow through suppressor. So far I’ve put about 300 rounds through the rifle and it has quickly become one of my favorite builds. The length is perfect and the overall length with my K config suppressor attached is just one inch longer than my standard 16” rifles (with just the muzzle device). My wife shot a 0.5” group at 50 yards with 3x magnifier with her first 5 shots. Later that day I shot a 1.7 MOA group with 3x at 100 yards. Not stellar but with 3x and shooting off my bag with no stable platform I’m very happy with that performance. I am likely to build my next rifle with another of these barrels.
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13.9" 5.56
Great quality product, fit prefect in my left-handed stag upper, no blemishes Can not wait to take it to the range This is my 5th Faxon barrel
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Excellent
Purchased to build my wife’s lightweight tactical rifle. I built it with carbine style handguard a. I wasn’t aiming for sub MOA but am extremely pleased with a 1.2” group. Pinned and welded to a Surefire Warcomp came to 16.25! Accurate description.
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Gunner Barrel
Bought this barrel for a gun build for my cousin, wanted something lightweight for a female, but durable that can run a gun all day and be suppressed. And this barrel is it; the taper to pencil after the gas block with a silencer is equivalent to a 16" gov profile. She loves the fact that the gun feels lighter, but it's not lighter it's just balanced better not being end heavy at the muzzle. It's safe to say 13.9" pin & weld gunners will be her barrel for future builds.