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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.
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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.
Faxon Lifetime Guarantee. Covers manufacturing and material defects to the original purchaser. Excludes damage from misuse, neglect, non-standard ammunition, or modifications. Register your product at faxonfirearms.com/product-registration to expedite service. For purchases through dealers or distributors, warranty repairs are handled directly by Faxon Firearms; refunds must be processed through the selling entity. Full policy: faxonfirearms.com/warranty-privacy-terms/
- 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"
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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.