Brownells Brn-4 Stripped Barrel,14.5'' Heavy, 1-7, 1/2''-28,Blk Nitride

The Brownells BRN-4 Stripped Barrel in 14.5" heavy profile is a purpose-built barrel for builders and shooters who want HK 416-compatible parts without the price tag or lead times that have historically plagued this platform. Machined by Faxon and designed to work seamlessly with early-generation HK 416 upper receivers, this barrel gives you the rigid, classic heavy contour that defined the original 416 platform while keeping flex to a minimum. Whether you're assembling a precision rifle, a duty-grade build, or just want a proven profile you can trust, this stripped barrel is the foundation that makes it happen.

The 14.5" length hits a sweet spot for intermediate-range work—short enough for handling in tight spaces, long enough to wring genuine velocity out of 5.56 NATO and .223 Remington ammunition. The 1-7 twist rate handles the full spectrum of modern .223 projectiles, from lightweight plinking rounds to heavier match-grade and barrier-penetrating loads. Standard 1/2"-28 muzzle threads let you thread on whatever muzzle device fits your mission: a suppressor, a flash hider, a compensator, or a brake. The deep black nitride finish is a workhorse—hard, durable, corrosion-resistant, and genuinely easy to clean compared to harder coatings that trap debris.

Installation is straightforward if you follow the system: this barrel mates with the BRN-4 barrel nut (sold separately) and requires torque specification of 50–80 ft-lbs. All BRN-4 barrels accept the same piston rod assembly, so your gas system choice depends only on matching the correct gas block to your barrel length. Stripped barrels ship without gas blocks or bolt carrier groups—you're buying the rifled tube and extension, which means you control exactly what goes downrange and how it performs.

Key Features

• 14.5" heavy contour profile for rigidity and minimal flex
• 1-7 twist rifling compatible with .223 Remington and 5.56 NATO
• 1/2"-28 muzzle threads for suppressors, brakes, and flash hiders
• Black nitride finish inside and out for durability and easy maintenance
• HK 416 upper receiver compatible with extended barrel extension
• Works with BRN-4 bolt carrier group and gas block ecosystem

Specifications

Frequently Asked Questions

Will this barrel work with my HK 416 upper receiver?

Yes. This BRN-4 barrel is designed to fit early-generation HK 416 upper receivers and components. The extended barrel extension provides a robust interface with the upper receiver.

Do I need a specific gas block for this barrel?

Yes. All BRN-4 barrels use the same piston rod assembly, so you'll need to select the gas block that matches your 14.5" barrel length. Brownells offers two options (part numbers 078-000-708 and 078-000-709) to ensure proper fit and function. You'll also need gas block coil pins (part number 430-103-127) for final assembly.

What muzzle devices can I thread on this barrel?

Any suppressor, muzzle brake, flash hider, or other device threaded to 1/2"-28. This is a standard thread pitch widely used on modern .223/5.56 barrels and offers plenty of options.

Is this a complete barrel or stripped?

This is a stripped barrel—you're getting the rifled tube and extension only. You'll need to source and install a bolt carrier group, gas block, and barrel nut (Brownells part 430-100-141) separately to complete your build.