Brownells194200927
Brownells Brn-4 5.56X45 Nato 10.4'' Heavy Chrome Lined Barrel Phosphate$339.99
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Availability: In Stock
Current Stock: Out of stock
The Brownells BRN-4 5.56x45 10.4" medium profile barrel is a chrome-lined, phosphate-finished component engineered for builders working with HK 416-compatible platforms. Machined by Faxon, this barrel delivers the reliability of a proven design in a lighter, more maneuverable package than its heavy counterpart. The 10.4" length makes it well-suited for short-stroke piston systems, CQB-oriented builds, or compact tactical rifles where weight savings and handling matter without sacrificing barrel rigidity.
Built with button rifling and a 1-7 twist rate, this barrel reliably cycles both 5.56x45mm NATO and .223 Remington ammunition—giving you flexibility at the range or in the field. The ½-28 muzzle threads accept standard suppressors, muzzle brakes, and flash hiders, so you can configure the muzzle end to suit your mission. The phosphate finish provides a hard, corrosion-resistant exterior and interior surface that's straightforward to clean and maintain through heavy use.
Installation is straightforward with the BRN-4 barrel nut (torque spec: 50–80 ft/lbs), and the extended barrel extension ensures a solid interface with early-generation HK 416 upper receivers. All BRN-4 barrels share the same piston rod assembly, simplifying your parts selection—just match the correct gas block to your barrel length for hassle-free integration. Whether you're a long-time HK platform enthusiast or a first-time builder, this barrel removes the historical scarcity that once made HK 416-compatible components nearly impossible to source.
| Caliber | 5.56x45mm NATO / .223 Remington |
| Barrel Length | 10.4 inches |
| Profile | Medium |
| Rifling | Button rifled, 1-7 twist |
| Muzzle Thread | ½-28 |
| Finish | Phosphate |
| Lining | Chrome-lined |
| Manufacturer | Faxon (for Brownells) |
| Platform Compatibility | HK 416 compatible (early generations) |
| Barrel Nut Torque | 50–80 ft/lbs |
Yes, this barrel is designed for early-generation HK 416 upper receivers. The extended barrel extension ensures a robust fit with those receivers. Use the BRN-4 barrel nut for installation.
All BRN-4 barrels use the same piston rod assembly, so compatibility depends on matching the correct gas block to your barrel length. Consult Brownells' BRN-4 component lineup (search "BRN-4") to select the gas block rated for 10.4" barrels.
Yes. This barrel is chambered in 5.56x45mm NATO and will reliably cycle both NATO-spec 5.56x45mm and .223 Remington ammunition.
The ½-28 muzzle thread is a common standard that accepts most commercial suppressors, muzzle brakes, flash hiders, and other muzzle attachments with ½-28 specs. Verify your device matches this thread pitch before installation.
SKU: 194200175 • Weight: 1.1oz
Availability: In Stock
Current Stock: Out of stock
The Brownells BRN-4 5.56x45 10.4" medium profile barrel is a chrome-lined, phosphate-finished component engineered for builders working with HK 416-compatible platforms. Machined by Faxon, this barrel delivers the reliability of a proven design in a lighter, more maneuverable package than its heavy counterpart. The 10.4" length makes it well-suited for short-stroke piston systems, CQB-oriented builds, or compact tactical rifles where weight savings and handling matter without sacrificing barrel rigidity.
Built with button rifling and a 1-7 twist rate, this barrel reliably cycles both 5.56x45mm NATO and .223 Remington ammunition—giving you flexibility at the range or in the field. The ½-28 muzzle threads accept standard suppressors, muzzle brakes, and flash hiders, so you can configure the muzzle end to suit your mission. The phosphate finish provides a hard, corrosion-resistant exterior and interior surface that's straightforward to clean and maintain through heavy use.
Installation is straightforward with the BRN-4 barrel nut (torque spec: 50–80 ft/lbs), and the extended barrel extension ensures a solid interface with early-generation HK 416 upper receivers. All BRN-4 barrels share the same piston rod assembly, simplifying your parts selection—just match the correct gas block to your barrel length for hassle-free integration. Whether you're a long-time HK platform enthusiast or a first-time builder, this barrel removes the historical scarcity that once made HK 416-compatible components nearly impossible to source.
| Caliber | 5.56x45mm NATO / .223 Remington |
| Barrel Length | 10.4 inches |
| Profile | Medium |
| Rifling | Button rifled, 1-7 twist |
| Muzzle Thread | ½-28 |
| Finish | Phosphate |
| Lining | Chrome-lined |
| Manufacturer | Faxon (for Brownells) |
| Platform Compatibility | HK 416 compatible (early generations) |
| Barrel Nut Torque | 50–80 ft/lbs |
Yes, this barrel is designed for early-generation HK 416 upper receivers. The extended barrel extension ensures a robust fit with those receivers. Use the BRN-4 barrel nut for installation.
All BRN-4 barrels use the same piston rod assembly, so compatibility depends on matching the correct gas block to your barrel length. Consult Brownells' BRN-4 component lineup (search "BRN-4") to select the gas block rated for 10.4" barrels.
Yes. This barrel is chambered in 5.56x45mm NATO and will reliably cycle both NATO-spec 5.56x45mm and .223 Remington ammunition.
The ½-28 muzzle thread is a common standard that accepts most commercial suppressors, muzzle brakes, flash hiders, and other muzzle attachments with ½-28 specs. Verify your device matches this thread pitch before installation.
SKU: 194200175 • Weight: 1.1oz