Assembled from All New Components, Now with Handguard and Muzzle Device
The BRN-4® Upper Receiver is now available as a Complete Upper, with Handguard, Muzzle Device, Barrel and Gas System installed. Simply attach to your AR-15 lower receiver and you’re ready to hit the range!
These complete uppers have the option of shipping with a shorter barrel configuration, with a 9 inch Midwest Industries handguard, or on the longer length barrel models, a 13.5 inch Midwest Industries handguard. The handguards feature plentiful MLOK attachment point, as well as a full length picatinny rail.
Built from the ground up, the core of the BRN-4® Upper Receiver is an all new Bolt Carrier Group, featuring a slick nitride finish. The carrier itself is machined from one piece of forged 8620 steel. The bolt is precision machined from 9310 tool steel and headspaced prior to and after barrel installation.
The new BRN-4® barrel, produced by Faxon®, is available in a variety of profiles and lengths to suit your needs. Barrels are chambered 5.56x45mm NATO, are button rifled with a 1-7 twist, 1/2-28 muzzle and come with the appropriate gas block for a given barrel length. Barrels are available in a medium or heavy profile. The heavy profile ensures a rigid and robust platform for precision shooting. The medium profile balances the desire to have a lighter piston configuration, while still having plenty of barrel material to prevent drifting of grouping as the barrel heats.
The upper receiver utilized in this assembly is made completely new, from billet, to mirror the profiles commonly found on forged upper receivers. Contours of the upper are entirely machined from billet, so rounded areas such as the cam pin protrusion and complex contours will show machine passes more prominently. The machined upper is finished with matte black hard coat anodizing. The proper piston bushing is installed to eliminate any piston wear on the aluminum part, and is secured in place with blue threadlocker. The BRN-4® features much longer barrel nut threads, engaging the barrel extension over a much larger surface area than a standard AR-15. This ensure that the barrel is rigidly mounted with the pre-installed barrel nut. Barrel nut is torqued properly with AeroShell Grease 64 applied to the upper receiver threads. The barrel nut is reinstalled 3 times to ensure an accurate torque spec is achieved.
Gas blocks are vented forward, to reduce gas sent rearward into the system, and are mated specific to the 10.4 or 14.5/16 inch barrel lengths.
Upper includes Magpul ejection port cover and mil-spec charging handle.
Brownells recommend H1 or H2 recoil buffer with carbine recoil spring for optimal operation.
*** Brownells recommends use of 5.56x45mm NATO newly manufactured quality ammunition for optimal operation
All BRN-4 Upper Receiver Assemblies are test fired before final packaging. Upper may display signs of firing, such as brass marks on the shell deflector or slight fouling inside.
ALL NFA RULES APPLY.
Original price was: $1,299.99.$974.99Current price is: $974.99.
Assembled from All New Components, Now with Handguard and Muzzle Device
The BRN-4® Upper Receiver is now available as a Complete Upper, with Handguard, Muzzle Device, Barrel and Gas System installed. Simply attach to your AR-15 lower receiver and you’re ready to hit the range!
These complete uppers have the option of shipping with a shorter barrel configuration, with a 9 inch Midwest Industries handguard, or on the longer length barrel models, a 13.5 inch Midwest Industries handguard. The handguards feature plentiful MLOK attachment point, as well as a full length picatinny rail.
Built from the ground up, the core of the BRN-4® Upper Receiver is an all new Bolt Carrier Group, featuring a slick nitride finish. The carrier itself is machined from one piece of forged 8620 steel. The bolt is precision machined from 9310 tool steel and headspaced prior to and after barrel installation.
The new BRN-4® barrel, produced by Faxon®, is available in a variety of profiles and lengths to suit your needs. Barrels are chambered 5.56x45mm NATO, are button rifled with a 1-7 twist, 1/2-28 muzzle and come with the appropriate gas block for a given barrel length. Barrels are available in a medium or heavy profile. The heavy profile ensures a rigid and robust platform for precision shooting. The medium profile balances the desire to have a lighter piston configuration, while still having plenty of barrel material to prevent drifting of grouping as the barrel heats.
The upper receiver utilized in this assembly is made completely new, from billet, to mirror the profiles commonly found on forged upper receivers. Contours of the upper are entirely machined from billet, so rounded areas such as the cam pin protrusion and complex contours will show machine passes more prominently. The machined upper is finished with matte black hard coat anodizing. The proper piston bushing is installed to eliminate any piston wear on the aluminum part, and is secured in place with blue threadlocker. The BRN-4® features much longer barrel nut threads, engaging the barrel extension over a much larger surface area than a standard AR-15. This ensure that the barrel is rigidly mounted with the pre-installed barrel nut. Barrel nut is torqued properly with AeroShell Grease 64 applied to the upper receiver threads. The barrel nut is reinstalled 3 times to ensure an accurate torque spec is achieved.
Gas blocks are vented forward, to reduce gas sent rearward into the system, and are mated specific to the 10.4 or 14.5/16 inch barrel lengths.
Upper includes Magpul ejection port cover and mil-spec charging handle.
Brownells recommend H1 or H2 recoil buffer with carbine recoil spring for optimal operation.
*** Brownells recommends use of 5.56x45mm NATO newly manufactured quality ammunition for optimal operation
All BRN-4 Upper Receiver Assemblies are test fired before final packaging. Upper may display signs of firing, such as brass marks on the shell deflector or slight fouling inside.
ALL NFA RULES APPLY.
Out of stock
Assembled from All New Components, Now with Handguard and Muzzle Device
The BRN-4® Upper Receiver is now available as a Complete Upper, with Handguard, Muzzle Device, Barrel and Gas System installed. Simply attach to your AR-15 lower receiver and you’re ready to hit the range!
These complete uppers have the option of shipping with a shorter barrel configuration, with a 9 inch Midwest Industries handguard, or on the longer length barrel models, a 13.5 inch Midwest Industries handguard. The handguards feature plentiful MLOK attachment point, as well as a full length picatinny rail.
Built from the ground up, the core of the BRN-4® Upper Receiver is an all new Bolt Carrier Group, featuring a slick nitride finish. The carrier itself is machined from one piece of forged 8620 steel. The bolt is precision machined from 9310 tool steel and headspaced prior to and after barrel installation.
The new BRN-4® barrel, produced by Faxon®, is available in a variety of profiles and lengths to suit your needs. Barrels are chambered 5.56x45mm NATO, are button rifled with a 1-7 twist, 1/2-28 muzzle and come with the appropriate gas block for a given barrel length. Barrels are available in a medium or heavy profile. The heavy profile ensures a rigid and robust platform for precision shooting. The medium profile balances the desire to have a lighter piston configuration, while still having plenty of barrel material to prevent drifting of grouping as the barrel heats.
The upper receiver utilized in this assembly is made completely new, from billet, to mirror the profiles commonly found on forged upper receivers. Contours of the upper are entirely machined from billet, so rounded areas such as the cam pin protrusion and complex contours will show machine passes more prominently. The machined upper is finished with matte black hard coat anodizing. The proper piston bushing is installed to eliminate any piston wear on the aluminum part, and is secured in place with blue threadlocker. The BRN-4® features much longer barrel nut threads, engaging the barrel extension over a much larger surface area than a standard AR-15. This ensure that the barrel is rigidly mounted with the pre-installed barrel nut. Barrel nut is torqued properly with AeroShell Grease 64 applied to the upper receiver threads. The barrel nut is reinstalled 3 times to ensure an accurate torque spec is achieved.
Gas blocks are vented forward, to reduce gas sent rearward into the system, and are mated specific to the 10.4 or 14.5/16 inch barrel lengths.
Upper includes Magpul ejection port cover and mil-spec charging handle.
Brownells recommend H1 or H2 recoil buffer with carbine recoil spring for optimal operation.
*** Brownells recommends use of 5.56x45mm NATO newly manufactured quality ammunition for optimal operation
All BRN-4 Upper Receiver Assemblies are test fired before final packaging. Upper may display signs of firing, such as brass marks on the shell deflector or slight fouling inside.
ALL NFA RULES APPLY.
| Weight | 7 lbs |
|---|---|
| Muzzle | 1/2-28 |
| Model | BRN-4 |
| Twist | 1-7 |
| Cartridge | AKK_5.56 x 45 |
| Contour | Heavy |
| Make | Brownells |
| Color | Black |
| Style | Complete |
| Length | 14.5'' |
| Make/Model | Brownells, BRN-4 |
We stock both premium factory-new components and high-quality once-fired brass. Please check the specific product listing title and description carefully; once-fired brass is fully inspected, but we always recommend resizing and inspecting prior to priming and powder charging.
Our standard reloading dies and case length trimmer accessories utilize industry-standard threads (typically 7/8"-14) compatible with major single-stage, turret, and progressive presses like RCBS, Hornady, Lee Precision, and Dillon. Caliber-specific trim gauges must match your exact brass caliber.
Yes. Non-hazardous reloading equipment (dies, case length trimmers, gauges, and unprimed brass) ships via standard ground carriers with no extra fees. Any orders containing smokeless powders or primers will incur standard federal HazMat handling fees and cannot be shipped via air transportation.
Precision reloading gear is valuable, so all orders are shipped with tracking enabled. As soon as your package is dispatched from our inventory warehouse, a tracking number will be emailed to you. You can monitor your shipment directly on our Track Order page using your unique Order ID.
We accept returns on unused, unaltered tools, case preparation equipment, and unopened component boxes within 30 days of item delivery. Due to safety and strict quality control on the reloading bench, we absolutely cannot accept returns on opened packs of primers, smokeless powder, or processed brass casings.
