Faxon 5.56 NATO 10.5 Pencil Barrel

Faxon 5.56 NATO 10.5 Pencil Barrel


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10.5″ PENCIL, 5.56 NATO, Carbine-Length, 4150 QPQ
Availability: Out of stock SKU: 15A58C10NPQ

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Faxon 5.56 NATO 10.5″ Pencil Barrel

Faxon 5.56 NATO 10.5″ Pencil, modeled after the Colt SP1, is an ideal balance of weight and performance.

Manufactured 100% in-house from gun-barrel-quality bar-stock, the Faxon 5.56 NATO 10.5″ Pencil Barrel starts with 4150 Chrome Moly Vanadium Mil-Spec steel. From there, the barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. This beautiful 5.56 NATO 20″ Gunner barrel is individually checked for headspace by precision custom hardened gauges.

Faxon Pencil barrels are the lightest in the industry. Don’t just taken their word for it, major companies like Robar, Kaiser US, 2A Armament, and others choose Faxon Pencils for their ideal balance of weight and performance.



Product Specifications

  • Manufacturer: Faxon Firearms
  • Part #: 15A58C10NPQ
  • UPC: 816341023086
  • Barrel Material: 4150 CMV Steel
  • Barrel Type: Button Rifled
  • Caliber: 5.56 NATO
  • Twist: 1:8
  • Length: 10.5”
  • Profile: Pencil
  • Gas System: Carbine
  • Inside Finish: QPQ Nitride
  • Outside Finish: QPQ Nitride
  • Muzzle Thread: 1/2-28 TPI (Threads Per Inch)
  • Gas Block Diameter: .625″
  • Gas Port Diameter: .081″
  •  Journal Length: 1.1″
  • Barrel Extension: M4
  • Weight: 0.9 lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown
  • MSRP: $159.00


Arm or Ally is a stocking dealer for all Faxon Firearms, Ballistic Advantage, Rosco Manufacturing, Aero Precision, Toolcraft, Elftmann Tactical, HIPERFIRE and more. See our growing inventory of AR Parts and Reloading Components.

Additional information

Weight 17 oz
Dimensions 11.5 × 2 × 2 in
Barrel Finish

QPQ Nitride

Barrel Length



5.56 NATO




4150 Chrome Moly Vanadium

Part Type

Barrel, Upper Receiver Parts





Muzzle Thread

1/2 x 28

Twist Rate


Gas Block Diameter


Gas System