Faxon 10.5 inch 300 BLK Gunner profile barrel with factory pinned .750 gas block

FAXON PINNED GAS BLOCK GUNNER PROFILE 10.5" PISTOL-LENGTH 300 BLK AR15 BARREL

Faxon
SKU:
15A38P10NGQ-APGB
|
UPC:
816341025431
$225.00
(3 reviews)
Current Stock:
Description

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

Caliber
300 AAC Blackout
Length
10.5"
Profile
Gunner
Gas System
Pistol-Length
Material
4150 CMV Steel
Rifling
Button-Rifled, 1:8 Twist
Finish
Salt Bath Nitride (inside & out)
Muzzle Thread
5/8x24
Gas Block Diameter
.750" (factory pre-pinned)
Gas Block Journal Length
1.9"
Barrel Extension
M4
Weight
1.10 lb (approx.)
Crown
11° Target Crown

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.

Additional Information
Barrel Material:
4150 CMV
Barrel Type:
Button Rifled
Caliber:
300 BLK
Barrel Length:
10.5"
Barrel Twist:
1:8
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
Weight:
1.10 lbs
Crown Type:
Recessed 11-degree Target Crown
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Reviews

  • 5
    Solid

    Posted by Sedrick R. Jones on Dec 24th 2021

    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.

  • 5
    Faxon Barrel

    Posted by Loren on Dec 19th 2021

    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.

  • 5
    FAXON 10.5" GUNNER PROFILE AR15 BARREL, 300 BLK, PINNED GAS BLOCK

    Posted by Manny Alvarez on Aug 13th 2021

    Excellent quality barrel! I highly recommend it.