Faxon 16 inch 5.56 Pencil profile barrel with factory pinned .625 gas block

FAXON PINNED GAS BLOCK PENCIL PROFILE 16" MID-LENGTH 5.56 NATO AR15 BARREL

Faxon
SKU:
15A58M16NPQ-APGB
|
UPC:
816341025417
Availability:
Usually ships within 2 business days when available.
$228.00
(4 reviews)
Current Stock:
Description

Faxon Pinned Gas Block — 16" Pencil Profile 5.56 NATO AR-15 Barrel (Mid-Length Gas)

Featherweight performance with a factory pre-pinned .625" gas block for unmatched reliability.

The Faxon 16" 5.56 Pencil Barrel with Pinned Gas Block delivers lightweight handling and rock-solid performance. Each barrel is pre-notched and paired with a pre-drilled, low-profile gas block that’s pinned and aligned in-house—saving you time and ensuring your gas system never shifts during use.

Crafted from 4150 CMV steel and finished inside and out with black nitride, this Pencil contour barrel offers excellent corrosion resistance, accuracy, and balance. Every Faxon barrel is stress relieved, air-gauge tested, MPI-inspected, and headspace verified for dependable performance in every environment.

Key Benefits

  • Factory-pinned .625" gas block: Pre-drilled and aligned for long-term stability under recoil.
  • Lightweight Pencil profile: Improves handling and reduces fatigue without sacrificing accuracy.
  • Mid-length gas system: Smooth, consistent cycling and reduced wear on internal parts.
  • Durable nitride finish: Corrosion-resistant inside and out for extended service life.
  • Stringent QC: Stress relieved, air-gauge tested, MPI-inspected, and headspace verified in-house at Faxon Firearms.

Specifications

Caliber
5.56 NATO
Length
16"
Profile
Pencil
Gas System
Mid-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
1.20 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, and the gas block is pre-drilled and aligned at the factory. The pin and gas block are included (hand-tightened for shipping).
Why choose a Pencil profile?
The Pencil contour offers the lightest possible configuration without compromising accuracy, making it ideal for fast, maneuverable builds.
What muzzle devices fit?
Compatible with all standard 1/2x28 muzzle devices and suppressor adapters for 5.56 / .223.

Overview: 16" Pinned Gas Block Pencil 5.56 Barrel

The Faxon Pinned Gas Block 16" Pencil 5.56 Barrel provides lightweight precision and unmatched dependability. Its factory-pinned .625" gas block ensures stability, while the Pencil profile shifts the rifle’s balance rearward for faster handling. Each barrel is stress relieved, air-gauge tested, MPI-inspected, and headspace checked to Faxon’s exacting standards.

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/