Faxon 308 WIN 20″ Big Gunner Barrel

Faxon 308 WIN 20″ Big Gunner Barrel


20″, Big Gunner, .308 WIN, Mid-Length, 4150, Nitride
Availability: In stock SKU: 10A810R20NGQ

Gas Tubes

Gas tubes include a roll pin.

Gas Blocks

Low profile gas blocks.

  • Description
  • Additional information
  • Questions & Answers


Faxon 308 WIN 20″ Big Gunner Barrel

Faxon 308 WIN 20″ Big Gunner, fully stress relieved, air-gauged, and 11 degree target crowned to ensure superior accuracy.

Manufactured 100% in-house from gun-barrel-quality bar-stock, the Faxon 308 WIN 20″ Big Gunner 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 308 WIN 20″ Big Gunner barrel is individually checked for headspace by precision custom hardened gauges.

Just what is the Big Gunner profile?

The Big Gunner profile is the big brother to Faxon’s popular 5.56 NATO Gunner barrel; a blend of two of the best performing profiles of all time, Government, and Pencil.

Proving every once and awhile, the Government can do something right, the Big Gunner profile from extension to gas block mimics that well-known taper. Innovation then takes over and the Big Gunner moves to our famed pencil front end.

Removing weight from the front of the barrel ensures maximum versatility and keeps material to the rear to maximize heat resistance and mitigate whip.


Product Specifications

  • Manufacturer: Faxon Firearms
  • Part #: 10A810R20NGQ
  • UPC: 816341023308
  • Barrel Material: 4150 Certified Gun Barrel Quality Steel
  • Barrel Type: Button Rifled
  • Caliber: 308 Winchester
  • Twist: 1:10
  • Length: 20”
  • Profile: Big Gunner
  • Gas System: Rifle
  • Inside Finish: QPQ Nitride
  • Outside Finish: QPQ Nitride
  • Muzzle Thread: 5/8-24 TPI (Threads Per Inch)
  • Gas Block Diameter: .750″
  • Barrel Extension: DPMS LR-308 Compatible – Nickel Teflon Coated
  • Weight: 2.24 lbs
  • Magnetic Particle Inspected!
  • 11-degree Target Crown
  • MSRP: $259.00

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Additional information

Weight 38 oz




Muzzle Thread

5/8 x 24

Gas Block Diameter


Gas System



Barrel, Upper Receiver Parts