Faxon 10.5 inch 5.56 Pencil barrel with factory pinned .625 gas block

FAXON PINNED GAS BLOCK PENCIL PROFILE 10.5" CARBINE-LENGTH 5.56 NATO AR15 BARREL

Faxon
SKU:
15A58C10NPQ-APGB
|
UPC:
816341025455
Availability:
Usually ships within 2 business days when available.
$220.00
(3 reviews)
Current Stock:
Description

Faxon Pinned Gas Block — 10.5" Pencil Profile 5.56 NATO AR-15 Barrel (Carbine Gas)

Factory pre-pinned .625" gas block included for maximum reliability in a lightweight Pencil profile.

The Faxon 10.5" Pencil Profile Barrel with Pinned Gas Block combines Faxon’s lightweight contour with a factory-installed, pre-drilled gas block and pin—saving time, effort, and ensuring long-term reliability. The gas block is pre-notched and pre-aligned in-house for a perfect fit every time.

Built from 4150 CMV steel and finished inside and out in black nitride, this Pencil contour barrel keeps weight to a minimum while maintaining accuracy and rigidity. Ideal for compact, maneuverable builds, this carbine-length barrel is stress relieved, air-gauge tested, MPI inspected, and headspace verified for duty-grade performance.

Key Benefits

  • Factory-pinned .625" gas block: Precision aligned and installed for secure operation.
  • Ultra-lightweight Pencil profile: Minimizes front-end weight for fast handling and reduced fatigue.
  • Carbine-length gas system: Reliable performance with both unsuppressed and suppressed setups.
  • Durable nitride finish: Resists wear, corrosion, and fouling for long-term use.
  • Rigorous QC: Stress relieved, air-gauge tested, MPI-inspected, and headspace verified in-house by Faxon Firearms.

Specifications

Caliber
5.56 NATO
Length
10.5"
Profile
Pencil
Gas System
Carbine-Length
Material
4150 CMV Steel
Rifling
Button-Rifled, 1:8 Twist
Finish
Salt Bath Nitride (inside & out)
Muzzle Thread
1/2x28
Gas Block Diameter
.625" (factory pre-pinned)
Gas Block Journal Length
1.1"
Barrel Extension
M4
Weight
0.9 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 barrel is pre-notched, the gas block is pre-drilled and aligned, and the pin is included (hand-tightened for safe shipping).
What makes the Pencil profile different?
The Pencil contour is thinner and lighter than standard profiles, shifting the rifle’s balance closer to the shooter for faster handling and less fatigue.
Is this barrel suppressor-safe?
Yes. It’s nitride treated inside and out for durability and corrosion resistance, and fully capable of handling suppressed fire.

Overview: 10.5" Pinned Gas Block Pencil 5.56 Barrel

The Faxon 10.5" Pinned Gas Block Pencil Barrel delivers lightweight precision with duty-ready dependability. The Pencil profile minimizes weight while maintaining heat resistance and accuracy, and the factory-pinned gas block ensures your gas system stays locked in place even under heavy use.

Constructed from 4150 CMV steel and finished in QPQ nitride, every Faxon barrel is stress relieved, air-gauge tested, MPI-inspected, and headspace checked for consistent performance you can trust.

Warranty 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/