Faxon Firearms 20" .308 Win Rifle Length Big Gunner Barrel

SKU: 10A810R20NGQ
MPN: 10A810R20NGQ
Manufactured by Faxon Firearms
1 Reviews


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Faxon Machining engineers and manufactures components that are found everywhere. In theaters of combat, on the ocean floor, in cars, in aircraft, on the ISS, and on Mars. Now, they bring their engineering excellence to bear on providing new and innovative components for the AR-15 platform that set the standard for quality. Faxon Firearms, manufacturing strategic solutions for tactical problems.

Manufacturing of Faxon barrels begins and ends in their Cincinnati, Ohio facility under ISO 9001/9100 quality certifications. Each barrel they produce is fully stress relieved, air-gauge tested, and 11-degree target crowned to ensure superior accuracy.

Crafted from the best materials, either certified 4150 MIL-SPEC steel or 416R stainless, each barrel undergoes rigorous quality controls before QPQ finishing and final inspection. Once finished, each barrel is examined for proper headspace using precision custom hardened gauges.

NOTE: Faxon Firearms barrels are chambered to SAAMI specification .308 Winchester at a nominal headspace depth (passing "Go" and failing "No-Go").

  • DPMS compatible
  • Chambered in .308 Winchester with a 1:10 twist
  • 4150 chrome moly vanadium steel
  • Rifle length gas system
  • Big Gunner profile
  • 5/8x24 thread pitch
  • Gas seat diameter: 0.750"
  • QPQ nitride finish
  • Button rifled
  • Magnetic particle inspected
  • LR-308 barrel extension
  • 11-degree target crown
  • Weight: 2.24 lbs


Barrel CoatingSalt Bath Nitride
Barrel ContourBig Gunner
Barrel Length20
Barrel LiningSalt Bath Nitride
Barrel Material4150 Chrome Moly Steel
BrandFaxon Firearms
Caliber Gauge.308 Win
Feed RampsM4
Gas Seat Diameter.750
Gas System LengthRifle
Thread Pattern5/8 X 24
Twist Rate1:10
Weight2.24 lbs

Ratings & Reviews

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Total garbage 1 bad head space 2 chamber full of burs 3 barrel extension full of burs 4 Even the darn feed ramp has burs 5 NO GAS BLOCK MARKING TO SHOW WHERE THE GAS HOLE IS in relation to the gas port in the top really these people make stuff that goes into space? Hope the hell the astronauts have a good life insurance plan