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 BROWNELLS BRN-4 5.56MM 10.4" 1-7 TWIST HEAVY NITRIDE BARREL Support

Discover the BRN-4 5.56mm barrels, featuring heavy or medium profiles, 1-7 twist, nitride finish, and compatibility with HK® 416 components for versatile performance.

BROWNELLS BRN-4 5.56MM 10.4" 1-7 TWIST HEAVY NITRIDE BARREL

050806500709 080001439

Filters:

Variations
Filters:
Variations:

Variations:

Discover the BRN-4 5.56mm barrels, featuring heavy or medium profiles, 1-7 twist, nitride finish, and compatibility with HK® 416 components for versatile performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 5.56MM 10.4" 1-7 TWIST HEAVY NITRIDE BARREL
304.9 GBP 0 £304.90 *
Not available
Cartridge: 5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 10.4'' Make: Heckler & Koch, Brownells Model: BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001439
Not available
304.9 GBP 0 £304.90 *
The Brownells BRN-4 10.4" barrel offers HK® 416 compatibility, a durable black nitride finish, and a lightweight medium profile for enhanced handling.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,10.4" MEDIUM, 1-7, 1/2"-28,BLK NITRIDE
279.9 GBP 102 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Medium Finish: Black Nitride Gas System Length: 416 Length: 10.4'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001440
In stock
279.9 GBP 102 £279.90 *
The BRN-4 14.5" Heavy Barrel features HK® 416 compatibility, robust construction, easy installation, and a durable black nitride finish for reliable performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,14.5" HEAVY, 1-7, 1/2"-28,BLK NITRIDE
279.9 GBP 319 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 14.5'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001441
In stock
279.9 GBP 319 £279.90 *
Discover the Brownells BRN-4 14.5" Medium Barrel, featuring a durable black nitride finish, 1-7 twist, and compatibility with HK® 416 components for versatile performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,14.5" MEDIUM, 1-7, 1/2"-28,BLK NITRIDE
279.9 GBP 558 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Medium Finish: Black Nitride Gas System Length: 416 Length: 14.5'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001442
In stock
279.9 GBP 558 £279.90 *
The BRN-4 16.5" Heavy Barrel offers HK® 416 compatibility, a durable black nitride finish, and 1-7 twist for precision with 5.56x45mm NATO ammunition.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,16.5" HEAVY, 1-7, 1/2"-28, BLK NITRIDE
279.9 GBP 248 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 16'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001443
In stock
279.9 GBP 248 £279.90 *
Discover the Brownells BRN-4 16.5" Medium Barrel, featuring a durable black nitride finish, 1-7 twist, and compatibility with HK® 416 components for versatile performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,16.5" MEDIUM, 1-7, 1/2"-28,BLK NITRIDE
284.9 GBP 650 £284.90 *
In stock
Cartridge: 5.56 x 45 Contour: Medium Finish: Black Nitride Gas System Length: 416 Length: 16'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001444
In stock
284.9 GBP 650 £284.90 *
279.9 304.9 6 GBP
304.9 GBP £304.90

Prices inclusive of duty & VAT.

Product no.: 080001439

Mfr. No.: BN-BRN4556-10.4

050806500709 Brownells BRN-4 HK® 416 compatible barrels, available in a variety of lengths and two contours. Historically extremely hard to procure, HK® 416 compatible barrels are now available as part of the BRN-4 lineup. These barrels machined by Faxon, fit early generations of HK® 416 upper receivers and components. They are the perfect fit with the BRN-4 bolt carrier group and gas block (search “BRN-4” for all parts). Available in common barrel lengths of 10.4, 14.5 and 16 inch, these barrels are suitable for any need. You can select the classic “heavy” profile, which is similar to the profile found on earlier HK® 416 models, ensuring barrel rigidity with minimal flex, or you can pick the new “medium” profile, which saves weight and makes the rifle quite handy. Barrels are button rifled with a 1-7 twist and have commonly used ½-28 muzzle threads for the attachment of the muzzle device of your choice. A deep black nitride finish provides an extremely hard exterior and interior, that is easy to clean. The longer barrel extension of the BRN-4 allows for a robust matchup to the upper receiver, and a simple install with the BRN-4 barrel nut (430-100-141). 5.56x45mm NATO chamberings allow for a wide variety of commercially found ammunition to function, as well as 223 Remington cartridges. No need to worry about picking the right gas system length, as all of these barrels have the same piston rod assembly (078-000-644), just be sure to pick the correct BRN-4 gas block to match your overall barrel length, 078-000-708 & 078-000-709). Be sure to pick up the gas block coil pins for final assembly as well (430-103-127). Recommended Barrel Nut Torque: 50-80 ft/lbs.
Not available
Be the first to rate this product

Not available.

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
279.9 304.9 6 GBP
Description Specification Customers reviews Accessories

BROWNELLS BRN-4 5.56MM 10.4" 1-7 TWIST HEAVY NITRIDE BARREL

304.9 GBP £304.90

Prices inclusive of duty & VAT.

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

Description:

Introducing the BRN-4 Barrels – Precision and Performance for Your Firearm

The Brownells BRN-4 is a line of HK® 416 compatible barrels, now available in various lengths and contours, making them a must-have for any firearms enthusiast.

Product Features:

  • Compatibility: Designed to fit early generations of HK® 416 upper receivers and components.
  • Barrel Lengths: Available in 10.4", 14.5", and 16" lengths to suit any shooting need.
  • Profiles: Choose between the classic “heavy” profile for rigidity or the new “medium” profile for a lighter, more handy rifle.
  • Twist Rate: Button rifled with a 1-7 twist for enhanced accuracy.
  • Muzzle Threads: Commonly used ½-28 threads for easy attachment of your preferred muzzle device.
  • Finish: Deep black nitride finish ensuring a hard exterior and interior that is easy to clean.
  • Barrel Extension: Longer barrel extension for a robust match to the upper receiver and easy installation with the BRN-4 barrel nut (430-100-141).
  • Chambering: 5.56x45mm NATO compatible, allowing for a wide variety of commercially available ammunition, as well as .223 Remington cartridges.
  • Gas System: All barrels feature the same piston rod assembly (078-000-644), simplifying the selection of the correct gas block (078-000-708 & 078-000-709).
  • Final Assembly: Remember to pick up the gas block coil pins (430-103-127) for final assembly.
  • Recommended Torque: Barrel nut torque should be between 50-80 ft/lbs.

With the Brownells BRN-4 barrels, you can ensure that your firearm not only meets but exceeds your expectations in performance and reliability.



Restrictions

  • Is a 'Call to order' product.

Top takeaways

  1. Brownells BRN-4 barrels are HK® 416 compatible, available in heavy and medium profiles, and come in lengths of 10.4, 14.5, and 16 inches.
  2. These barrels are button rifled with a 1-7 twist, have a black nitride finish, and feature ½-28 muzzle threads for attaching various devices.
  3. The barrels are designed for easy installation with the BRN-4 barrel nut and are chambered in 5.56x45mm NATO, also accommodating .223 Remington cartridges.

Attributes

  • Cartridge: 
    5.56 x 45
  • Contour: 
    Heavy
  • Finish: 
    Black Nitride
  • Gas System Length: 
    416
  • Length: 
    10.4''
  • Model: 
    BRN-4
  • Muzzle Threads: 
    1/2-28
  • Twist: 
    1-7
  • Weapon type: 
    Brownells
    , 
    Heckler & Koch
  • Delivery weight: 0.522kg
  • Shipping height: 25mm
  • Shipping width: 25mm
  • Shipping length: 286mm
  • UPC: 050806500709

Item details

Made in USA
US export classification: 0A501.c

Customers reviews

Customer ratings (0)

0 / 5

Variations:

Discover the BRN-4 5.56mm barrels, featuring heavy or medium profiles, 1-7 twist, nitride finish, and compatibility with HK® 416 components for versatile performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 5.56MM 10.4" 1-7 TWIST HEAVY NITRIDE BARREL
304.9 GBP 0 £304.90 *
Not available
Cartridge: 5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 10.4'' Make: Heckler & Koch, Brownells Model: BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001439
Not available
304.9 GBP 0 £304.90 *
The Brownells BRN-4 10.4" barrel offers HK® 416 compatibility, a durable black nitride finish, and a lightweight medium profile for enhanced handling.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,10.4" MEDIUM, 1-7, 1/2"-28,BLK NITRIDE
279.9 GBP 102 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Medium Finish: Black Nitride Gas System Length: 416 Length: 10.4'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001440
In stock
279.9 GBP 102 £279.90 *
The BRN-4 14.5" Heavy Barrel features HK® 416 compatibility, robust construction, easy installation, and a durable black nitride finish for reliable performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,14.5" HEAVY, 1-7, 1/2"-28,BLK NITRIDE
279.9 GBP 319 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 14.5'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001441
In stock
279.9 GBP 319 £279.90 *
Discover the Brownells BRN-4 14.5" Medium Barrel, featuring a durable black nitride finish, 1-7 twist, and compatibility with HK® 416 components for versatile performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,14.5" MEDIUM, 1-7, 1/2"-28,BLK NITRIDE
279.9 GBP 558 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Medium Finish: Black Nitride Gas System Length: 416 Length: 14.5'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001442
In stock
279.9 GBP 558 £279.90 *
The BRN-4 16.5" Heavy Barrel offers HK® 416 compatibility, a durable black nitride finish, and 1-7 twist for precision with 5.56x45mm NATO ammunition.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,16.5" HEAVY, 1-7, 1/2"-28, BLK NITRIDE
279.9 GBP 248 £279.90 *
In stock
Cartridge: 5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 16'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001443
In stock
279.9 GBP 248 £279.90 *
Discover the Brownells BRN-4 16.5" Medium Barrel, featuring a durable black nitride finish, 1-7 twist, and compatibility with HK® 416 components for versatile performance.
BRN-4 BARRELS 5.56X45MM - BRN-4 STRIPPED BARREL,16.5" MEDIUM, 1-7, 1/2"-28,BLK NITRIDE
284.9 GBP 650 £284.90 *
In stock
Cartridge: 5.56 x 45 Contour: Medium Finish: Black Nitride Gas System Length: 416 Length: 16'' Make: Heckler & Koch, Brownells Model: HK416, MR556, BRN-4 Muzzle Threads: 1/2-28 Twist: 1-7 Product no.: 080001444
In stock
284.9 GBP 650 £284.90 *

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