Your basket is empty.

Basket

Help and contact

Free standard delivery over £199

100-day return policy

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

The BRN-4 Piston Upper Receiver Kit offers HK® 416 compatibility, a lightweight medium profile barrel, and includes all necessary components for assembly.

BROWNELLS BRN-4 10.4" UPPER RECEIVER KIT W/ MEDIUM PROFILE BARREL

430103477

Restrictions

Is a 'Call to order' product.

Top takeaways

The BRN-4 Piston Upper Receiver Kit features new Brownells BRN-4 components and surplus HK® parts, designed to be compatible with HK® 416 components.
Kit includes a nitride finished BRN-4 Bolt Carrier Group, a Faxon manufactured 5.56x45mm NATO barrel with a 1-7 twist, and a medium profile for better balance and weight reduction.
The unassembled upper kit comes with all necessary sub-components for assembly but does not include a lower receiver, and all NFA rules apply.

Attributes

Barrel Length:
```
10.4''
```
Barrel Type:
```
Threaded
```
Cartridge:
```
5.56 x 45
```
Contour:
```
Medium
```
Finish:
```
Black
```
Model:
```
BRN-4
```
Twist Rate:
```
1-7
```
Weapon type:
```
Brownells
```
Delivery weight: 1.361kg

Item details

Made in USA
US export classification: I(g)

Specifications:
Barrel Length: 10.4''
Barrel Type: Threaded
Cartridge: 5.56 x 45
Contour: Medium
Finish: Black
Make: Brownells
Model: BRN-4
Twist Rate: 1-7

1849.9 1849.9 1 GBP

1849.9 GBP £1,849.90

Prices inclusive of duty & VAT.

Product no.: 430103477

The Brownells BRN-4 Piston Upper Receiver Kits – Parts Kit New Production Brownells and surplus HK® Components Utilizing new production Brownells BRN-4 Bolt Carrier Groups and Barrels, the unassembled BRN-4 Upper Kits feature HK® 416 compatible components, in an affordable package. The heart of this bundle is the new BRN-4 Bolt Carrier Group, with nitride finish. This BCG is designed to be compatible with 416 components, such as the genuine 416 stripped upper this kit is paired with. The BRN-4 barrel is new production as well, manufactured by Faxon for Brownells. These barrels have a 5.56x45mm NATO chamber and have a 1-7 twist. The medium profile is slimmer than classic 416 barrels, ensuring the entire complete firearm balances well and reduces overall weight. Options include a 14.5 and 16 inch barrel. The Stripped Upper Receiver and Handguard are surplus HK® parts, and will likely show signs of wear and use. All sub-components are included that allow the user to assemble and install the upper on any standard AR-15 lower receiver. UPPER KIT DOES NOT COME ASSMEMBLED. ALL NFA RULES APPLY. Included components: HK® 416 Stripped Upper Receiver HK® 416 Quad Rail Handguard BRN-4 Operating Rod BRN-4 Gas Piston BRN-4 Gas Block BRN-4 Barrel BRN-4 Bolt Carrier Group BRN-4 Gas Block Coil Pins (2x) BRN-4 Barrel Nut BRN-4 Handguard Retaining Screw AR-15 Charging Handle Magpul® Enhanced Ejection Port Cover Forward Assist Assembly Geissele® Barrel Nut Wrench

Not available

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

1849.9 1849.9 1 GBP

Description Specification Customers reviews Accessories

BROWNELLS BRN-4 10.4" UPPER RECEIVER KIT W/ MEDIUM PROFILE BARREL

1849.9 GBP £1,849.90

Prices inclusive of duty & VAT.

Is a 'Call to order' product.

Requires order by phone

Description:

Discover the versatility of the BRN-4 Piston Upper Receiver Kits!

The Brownells BRN-4 Piston Upper Receiver Kits are designed for firearm enthusiasts seeking a reliable and affordable upgrade. These kits include new production Brownells components and surplus HK® parts, ensuring quality and compatibility.

Key Features:

New Production Components: Features the latest Brownells BRN-4 Bolt Carrier Groups and Barrels.
HK® Compatibility: The unassembled BRN-4 Upper Kits come with HK® 416 compatible components.
High-Quality Barrel: Manufactured by Faxon for Brownells, the barrel has a 5.56x45mm NATO chamber with a 1-7 twist.
Medium Profile: Slimmer than classic 416 barrels, enhancing balance and reducing weight.
Variety of Options: Available in 14.5 and 16 inch barrel lengths.
Surplus Parts: The Stripped Upper Receiver and Handguard are surplus HK® parts, potentially showing signs of wear.
Complete Assembly: All necessary sub-components are included for easy assembly on any standard AR-15 lower receiver.

Note: The UPPER KIT DOES NOT COME ASSEMBLED. All NFA rules apply.

Included Components:

HK® 416 Stripped Upper Receiver
HK® 416 Quad Rail Handguard
BRN-4 Operating Rod
BRN-4 Gas Piston
BRN-4 Gas Block
BRN-4 Barrel
BRN-4 Bolt Carrier Group
BRN-4 Gas Block Coil Pins (2x)
BRN-4 Barrel Nut
BRN-4 Handguard Retaining Screw
AR-15 Charging Handle
Magpul® Enhanced Ejection Port Cover
Forward Assist Assembly
Geissele® Barrel Nut Wrench

Upgrade your firearm with the Brownells BRN-4 Piston Upper Receiver Kits and experience the perfect blend of quality and performance!

Restrictions

Is a 'Call to order' product.

Top takeaways

The BRN-4 Piston Upper Receiver Kit features new Brownells BRN-4 components and surplus HK® parts, designed to be compatible with HK® 416 components.
Kit includes a nitride finished BRN-4 Bolt Carrier Group, a Faxon manufactured 5.56x45mm NATO barrel with a 1-7 twist, and a medium profile for better balance and weight reduction.
The unassembled upper kit comes with all necessary sub-components for assembly but does not include a lower receiver, and all NFA rules apply.

Attributes

Barrel Length:
```
10.4''
```
Barrel Type:
```
Threaded
```
Cartridge:
```
5.56 x 45
```
Contour:
```
Medium
```
Finish:
```
Black
```
Model:
```
BRN-4
```
Twist Rate:
```
1-7
```
Weapon type:
```
Brownells
```
Delivery weight: 1.361kg

Item details

Made in USA
US export classification: I(g)

Customers reviews

Customer ratings (0)

0 / 5

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

Connect

Secure payment methods

Trade Associations

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.