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FAXON PINNED GAS BLOCK GUNNER PROFILE 10.5" PISTOL-LENGTH 300 BLK AR15 BARREL
Faxon
$219.00
Not sure if this is the right 300 Blackout barrel?
We built a complete guide covering barrel length, twist rate (1:5 vs 1:8), suppressed performance, and series differences.
(3 reviews)
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Faxon
FAXON PINNED GAS BLOCK GUNNER PROFILE 10.5" PISTOL-LENGTH 300 BLK AR15 BARREL
Faxon Pinned Gas Block — 10.5" Gunner Profile 300 BLK AR-15 Barrel (Pistol Gas)
Factory pre-pinned .750" gas block included for rock-solid reliability and fast installs.
The Faxon 10.5" 300 Blackout Gunner Barrel with Pinned Gas Block removes the hardest part of short-barrel builds: correctly pinning the gas block. We pre-notch the journal, drill the block, and include the pin—so your gas system won’t shift or loosen under fire.
Built from 4150 CMV steel with a nitride finish, this Gunner profile blends Gov’t durability with Pencil-like weight savings for superb handling. Pistol-length gas optimizes function with both supers and subs (especially suppressed), while 1:8 twist stabilizes a wide range of 300 BLK projectiles.
Key Benefits
- Factory-pinned .750" gas block: Pre-drilled and aligned for maximum security and easy installation.
- Gunner profile balance: Gov’t strength with Pencil weight for faster transitions and reduced fatigue.
- Pistol-length gas: Reliable cycling with subsonic and supersonic 300 BLK, ideal for suppressed builds.
- Duty-ready construction: 4150 CMV, button-rifled 1:8, and QPQ nitride inside & out.
- Precision QC: Stress relieved, air-gauge tested, MPI-inspected, and headspace verified in-house.
Specifications
Included: Barrel, low-profile gas block (hand-tightened for shipping), and retaining pin.
Frequently Asked Questions
Is the gas block already pinned?
Yes. The journal is notched and the block is pre-drilled and aligned; pin and block are included (hand-tightened for transit).
Will this run subsonic and supersonic ammo?
Yes. The pistol-length gas system is ideal for 300 BLK, including suppressed use. Buffer/spring and gas porting can affect tuning.
What muzzle devices fit?
Standard 5/8x24 devices and suppressor adapters for 300 BLK / .30 cal.
Overview: 10.5" Pinned Gas Block Gunner 300 BLK Barrel
The Faxon Pinned Gas Block 10.5" 300 BLK Gunner Barrel gives builders a dependable, accuracy-focused barrel with a gas system that won’t budge. With its lightweight-forward Gunner contour, pistol-length gas, and corrosion-resistant nitride treatment, it’s a top choice for compact carbines—especially when running suppressed.
Every barrel is stress relieved, air-gauge tested, magnetic particle inspected, and headspace checked to deliver the quality and consistency Faxon Firearms is known for.
- Material:
- 4150 CMV
- Caliber:
- 300 BLK
- Length:
- 10.5"
- Rifling Twist Rate:
- 1:8
- Barrel Profile:
- Gunner
- Gas System Length:
- Pistol
- Finish:
- QPQ Nitride
- Muzzle Thread:
- 5/8x24
- Gas Block Diameter:
- .750"
- Gas Block Journal Length:
- 1.9"
Reviews
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Solid
I haven't shot it yet but I know quality when I feel it. This is a solid barrel. Just attached it to my Upper receiver now just waiting on my lower for the finishing touches.
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Faxon Barrel
This is the second barrel I have bought this year. Finish on this barrel is really nice and I can't wait until I get the rifle put together.
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FAXON 10.5" GUNNER PROFILE AR15 BARREL, 300 BLK, PINNED GAS BLOCK
Excellent quality barrel! I highly recommend it.