My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Wish list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Rifle Parts Barrel Parts Rifle Barrels FAXON FIREARMS DUTY 308 WIN 18" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE Support

The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, rigid design with a 1:10 twist for precision, ideal for competition and duty use.
-10 %

FAXON FIREARMS DUTY 308 WIN 18" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE

816341023284 100026135

Filters:

Variations
Filters:
Variations:

Variations:

-10 %
The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, rigid design with a 1:10 twist for precision, ideal for competition and duty use.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 18" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
299.9 GBP 11 £299.90 * £334.90
In stock
Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Rifle Length: 18'' Make: AR .308 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 100026135
In stock
299.9 GBP 11 £299.90 * £334.90
-9 %
The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, durable design with a 1:10 twist, optimized for accuracy and high rates of fire.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 16" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
289.9 GBP 6 £289.90 * £319.90
In stock
Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Mid-Length Length: 16'' Make: AR .308 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 100026134
In stock
289.9 GBP 6 £289.90 * £319.90
-10 %
The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, maneuverable design with a 1:10 twist, ideal for high accuracy in competition or duty use.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 13.9" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
279.9 GBP 3 £279.90 * £309.90
In stock
Barrel Weight: 1.8 lbs Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Mid-Length Length: 13.9'' Make: AR-15 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 430108160
In stock
279.9 GBP 3 £279.90 * £309.90
-10 %
Experience superior accuracy with the Faxon Firearms Duty 308 Big Gunner Barrel, featuring a lightweight design, medium-taper profile, and compatibility with common gas systems.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 20" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
309.9 GBP 5 £309.90 * £344.90
In stock
Barrel Weight: 2.24 lbs Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Rifle Length: 20'' Make: AR-15 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 430108161
In stock
309.9 GBP 5 £309.90 * £344.90
279.9 309.9 4 GBP
-10 %
MSRP £334.90
299.9 GBP £299.90

Prices inclusive of duty & VAT.

Product no.: 100026135

Mfr. No.: 10A810R18NGQ

816341023284 The Faxon Firearms Big Gunner .308 continue their fantastic barrel-making with a bit more punch. They have updated their previous Medium-Taper profile taking into account customer feedback, optimizing the barrel to meet the Gunner brand's high standards. The .308 Big Gunner profile barrels are the big-brother to our famous 5.56 Gunner barrels. The Big Gunners feature a medium-taper behind the gas block. The gas block journal is set to .750" for compatibility with most common gas blocks and 1.9" in length for long blocks or aftermarket piston kits. From the gas block journal forward we use a thinner taper, designed to reduce weight yet maintain rigidity for high rates of fire and as a suppressor host. The Gunner barrels are ideal for any competition or duty use. When the seconds count, count on the Gunner profile. SPECS 2Barrel Material: 4150 CMV Barrel Type: Button Rifled Barrel Caliber: .308 WIN Barrel Twist: 1:10 Barrel Length: 13.9” to 20” Barrel Profile: Big Gunner Barrel Gas System: Rifle Inside Finish: Salt Bath Nitride Outside Finish: Salt Bath Nitride Muzzle Thread: 5/8x24 TPI Gas Block Diameter: .750" Gas Block Journal Length: 1.9" Barrel Extension: LR-308 (DPMS Compatible) Weight: 1.8 to 2.24 lbs depending on barrel length Magnetic Particle Inspected 11-degree Target Crown Gun Tech Note: Faxon highly recommends properly checking the head space between your barrel and bolt before firing your new barrel. For accurate measurement, Faxon recommends using PTG headspace gauges with their barrels.
In stock More than 10 pieces in USA warehouse
5/5 - 1 Customers

Delivery time approx. 7-14 days.

100-Day Return Policy
No charges until we ship
No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.
Wish List Ask question
order by phone
279.9 309.9 4 GBP
Description Specification Customers reviews Accessories

FAXON FIREARMS DUTY 308 WIN 18" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE

-10 %
MSRP £334.90
299.9 GBP £299.90

Prices inclusive of duty & VAT.

Is a 'Call to order' product.
Requires order by phone

Description:

A Trim, Maneuverable Barrel With Nearly Match-Grade Accuracy Potential

The Faxon Firearms Big Gunner .308 continues their fantastic barrel-making with a bit more punch. They have updated their previous Medium-Taper profile taking into account customer feedback, optimizing the barrel to meet the Gunner brand's high standards.

The .308 Big Gunner profile barrels are the big-brother to our famous 5.56 Gunner barrels. The Big Gunners feature a medium-taper behind the gas block, with the gas block journal set to .750" for compatibility with most common gas blocks and 1.9" in length for long blocks or aftermarket piston kits.

From the gas block journal forward, we use a thinner taper, designed to reduce weight yet maintain rigidity for high rates of fire and as a suppressor host. The Gunner barrels are ideal for any competition or duty use. When the seconds count, count on the Gunner profile.

Specifications:

  • Barrel Material: 4150 CMV
  • Barrel Type: Button Rifled
  • Barrel Caliber: .308 WIN
  • Barrel Twist: 1:10
  • Barrel Length: 13.9” to 20”
  • Barrel Profile: Big Gunner
  • Barrel Gas System: Rifle
  • Inside Finish: Salt Bath Nitride
  • Outside Finish: Salt Bath Nitride
  • Muzzle Thread: 5/8x24 TPI
  • Gas Block Diameter: .750"
  • Gas Block Journal Length: 1.9"
  • Barrel Extension: LR-308 (DPMS Compatible)
  • Weight: 1.8 to 2.24 lbs depending on barrel length
  • Magnetic Particle Inspected
  • 11-degree Target Crown

Gun Tech Note: Faxon highly recommends properly checking the headspace between your barrel and bolt before firing your new barrel. For accurate measurement, Faxon recommends using PTG headspace gauges with their barrels.



Restrictions

  • Is a 'Call to order' product.

Top takeaways

  1. The Faxon Firearms Big Gunner .308 Win. Barrel is designed with a medium-taper behind the gas block and a thinner taper forward to balance weight and rigidity, suitable for high rates of fire and suppressor use.
  2. Constructed from 4150 chrome moly steel with a Nitride finish for durability, the barrel fits DPMS LR-308 Gen1 and Armalite AR-10 upper receivers, featuring a 1-10" twist and 5/8"-24 threaded muzzle.
  3. Faxon Firearms advises checking headspace with precision gauges before use and recommends PTG headspace gauges for their barrels to ensure safety and accuracy.

Attributes

  • Barrel Weight: -
  • Cartridge: 
    308 Winchester
  • Contour: 
    Big Gunner
  • Finish: 
    Black
  • Gas System Length: 
    Rifle
  • Length: 
    18''
  • Muzzle Threads: 
    5/8-24
  • Twist: 
    1-10
  • Weapon type: 
    AR .308
  • Delivery weight: 0.907kg
  • Shipping height: 32mm
  • Shipping width: 32mm
  • Shipping length: 483mm
  • UPC: 816341023284

Item details

Made in USA
US export classification: 0A501.c

Customers reviews

Customer ratings (1)

5 / 5
Definitely recommended

Brownells USA Faxon 20" .308 barrel 29/03/2018

I ordered this barrel and it just arrived today. Its a perfect fit on my Aero Precision upper. I haven't shot this rifle yet but it looks perfect. I wanted a .308 AR barrel that I could mount a standard "A" front sight on and this is the barrel you need for that. Faxon makes two AR .308 pencil barrels. On the one barrel the journal where the gas block or front base goes is too short for the "A" front sight base. This is the barrel you want for mounting the "A" front sight base. The journal length needed is 1.1 inch for the "A" front sight base. The other journal length is .6 inch long and is right for a gas block. I am completely satisfied.

Variations:

-10 %
The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, rigid design with a 1:10 twist for precision, ideal for competition and duty use.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 18" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
299.9 GBP 11 £299.90 * £334.90
In stock
Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Rifle Length: 18'' Make: AR .308 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 100026135
In stock
299.9 GBP 11 £299.90 * £334.90
-9 %
The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, durable design with a 1:10 twist, optimized for accuracy and high rates of fire.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 16" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
289.9 GBP 6 £289.90 * £319.90
In stock
Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Mid-Length Length: 16'' Make: AR .308 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 100026134
In stock
289.9 GBP 6 £289.90 * £319.90
-10 %
The Faxon Firearms Duty 308 Big Gunner barrel offers a lightweight, maneuverable design with a 1:10 twist, ideal for high accuracy in competition or duty use.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 13.9" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
279.9 GBP 3 £279.90 * £309.90
In stock
Barrel Weight: 1.8 lbs Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Mid-Length Length: 13.9'' Make: AR-15 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 430108160
In stock
279.9 GBP 3 £279.90 * £309.90
-10 %
Experience superior accuracy with the Faxon Firearms Duty 308 Big Gunner Barrel, featuring a lightweight design, medium-taper profile, and compatibility with common gas systems.
DUTY 308 WINCHESTER BIG GUNNER PROFILE RIFLE BARRELS FOR AR-308 - DUTY 308 WIN 20" 1-10 TWIST BIG GUNNER CONTOUR BBL NITRIDE
309.9 GBP 5 £309.90 * £344.90
In stock
Barrel Weight: 2.24 lbs Cartridge: 308 Winchester Contour: Big Gunner Finish: Black Gas System Length: Rifle Length: 20'' Make: AR-15 Muzzle Threads: 5/8-24 Twist: 1-10 Product no.: 430108161
In stock
309.9 GBP 5 £309.90 * £344.90

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top