Brownells194200930
Brownells Brn-4 5.56X45 Nato 16'' Heavy Chrome Lined Barrel, Phosphate$329.99
Availability: In Stock
Current Stock: Out of stock
The Brownells BRN-4 5.56x45 NATO 16" medium-profile barrel is a purpose-built replacement barrel for HK 416-compatible upper receivers. Machined by Faxon and engineered specifically for the BRN-4 platform, this barrel strikes a practical balance: the medium contour reduces overall weight compared to heavy profiles while maintaining the rigidity needed for reliable performance. Whether you're building a modern tactical rifle, upgrading an existing upper, or simply want a proven HK 416-spec barrel, the 16" length and medium profile make this a versatile choice for shooters who value a handy, well-balanced platform.
The barrel features button rifling with a 1-7 twist rate and 1/2"-28 muzzle threads, giving you broad compatibility with common suppressors and muzzle devices. It's chambered in 5.56x45 NATO and will also reliably cycle .223 Remington ammunition—no need to fret about ammo supply. The chrome-lined bore and phosphate finish provide durable corrosion resistance and easy maintenance, critical for a barrel you'll actually use in the field or at the range. The extended barrel extension design ensures a solid lockup with BRN-4 upper receivers and simplifies installation with the correct BRN-4 barrel nut.
This is a straightforward, quality component for serious builders who understand the HK 416 platform and need a dependable barrel that works with Brownells' own BRN-4 ecosystem. It's not a universal drop-in for every AR-pattern build—verify your upper receiver compatibility before ordering. Pair it with the appropriate BRN-4 gas block and barrel nut (sold separately) to complete your build.
| Caliber | 5.56x45 NATO (.223 Remington compatible) |
| Barrel Length | 16 inches |
| Profile | Medium |
| Rifling | Button rifled, 1-7 twist |
| Muzzle Thread | 1/2"-28 |
| Finish | Phosphate |
| Bore Treatment | Chrome lined |
| Platform | HK 416 compatible (BRN-4) |
| Recommended Barrel Nut Torque | 50–80 ft/lbs |
This barrel is designed for early generations of HK 416 upper receivers and the Brownells BRN-4 platform. Always verify your specific upper's compatibility before purchasing, as HK 416 variant generations and clones can have dimensional differences.
You'll need to select the correct BRN-4 gas block to match the 16" barrel length. All BRN-4 barrels use the same piston rod assembly, so gas block selection depends on your barrel length, not the barrel itself.
Yes. The extended barrel extension on the BRN-4 requires the BRN-4 barrel nut for proper installation and receiver lockup. You'll also need gas block coil pins for assembly. Torque the barrel nut to 50–80 ft/lbs.
Yes. The barrel is chambered in 5.56x45 NATO and will reliably cycle .223 Remington cartridges.
SKU: 194200188 • Weight: 1.43oz
Availability: In Stock
Current Stock: Out of stock
The Brownells BRN-4 5.56x45 NATO 16" medium-profile barrel is a purpose-built replacement barrel for HK 416-compatible upper receivers. Machined by Faxon and engineered specifically for the BRN-4 platform, this barrel strikes a practical balance: the medium contour reduces overall weight compared to heavy profiles while maintaining the rigidity needed for reliable performance. Whether you're building a modern tactical rifle, upgrading an existing upper, or simply want a proven HK 416-spec barrel, the 16" length and medium profile make this a versatile choice for shooters who value a handy, well-balanced platform.
The barrel features button rifling with a 1-7 twist rate and 1/2"-28 muzzle threads, giving you broad compatibility with common suppressors and muzzle devices. It's chambered in 5.56x45 NATO and will also reliably cycle .223 Remington ammunition—no need to fret about ammo supply. The chrome-lined bore and phosphate finish provide durable corrosion resistance and easy maintenance, critical for a barrel you'll actually use in the field or at the range. The extended barrel extension design ensures a solid lockup with BRN-4 upper receivers and simplifies installation with the correct BRN-4 barrel nut.
This is a straightforward, quality component for serious builders who understand the HK 416 platform and need a dependable barrel that works with Brownells' own BRN-4 ecosystem. It's not a universal drop-in for every AR-pattern build—verify your upper receiver compatibility before ordering. Pair it with the appropriate BRN-4 gas block and barrel nut (sold separately) to complete your build.
| Caliber | 5.56x45 NATO (.223 Remington compatible) |
| Barrel Length | 16 inches |
| Profile | Medium |
| Rifling | Button rifled, 1-7 twist |
| Muzzle Thread | 1/2"-28 |
| Finish | Phosphate |
| Bore Treatment | Chrome lined |
| Platform | HK 416 compatible (BRN-4) |
| Recommended Barrel Nut Torque | 50–80 ft/lbs |
This barrel is designed for early generations of HK 416 upper receivers and the Brownells BRN-4 platform. Always verify your specific upper's compatibility before purchasing, as HK 416 variant generations and clones can have dimensional differences.
You'll need to select the correct BRN-4 gas block to match the 16" barrel length. All BRN-4 barrels use the same piston rod assembly, so gas block selection depends on your barrel length, not the barrel itself.
Yes. The extended barrel extension on the BRN-4 requires the BRN-4 barrel nut for proper installation and receiver lockup. You'll also need gas block coil pins for assembly. Torque the barrel nut to 50–80 ft/lbs.
Yes. The barrel is chambered in 5.56x45 NATO and will reliably cycle .223 Remington cartridges.
SKU: 194200188 • Weight: 1.43oz