GRINNELL, Iowa – Brownells, the leading supplier of firearms accessories and gunsmithing tools, is thrilled to announce the release of the BRN-4® Upper Receiver, now available as an assembled upper. This highly anticipated upper is designed to fit both HK416-style and standard AR-15 lowers.
Assembled from all new components, the BRN-4® Upper comes fully assembled, with the barrel and gas system already installed. All you need to do is add your preferred HK® 416/ MR556 compatible handguard and any 1/2-28 muzzle device, and you’re ready to hit the range.
At the heart of the BRN-4® Upper Receiver is an all new Bolt Carrier Group, featuring a slick nitride finish. The carrier is machined from a single piece of forged 8620 steel and the blot is precision machined from 9310 tool steel, ensuring durability and reliability.
The BRN-4® barrel, produced by Faxon®, is available in various profiles and lengths in 10.4”, 14.5” or 16” to suit your specific needs. Chambered in 5.56x45mm NATO, these barrels are button rifled with a 1-7 twist and come with the appropriate gas block for a given length. Choose between a medium or heavy profile, depending on your shooting preferences. The heavy profile provides a rigid and robust platform for precision shooting, while the medium profile offers a lighter piston configuration without sacrificing barrel stability.
Crafted from billet, the upper receiver of the BRN-4® is meticulously machined to mirror the profiles commonly found on forged upper receivers. The rounded contours and matte black hard coat anodizing give it a sleek and professional look. The longer barrel nut threads ensure a rigid mount, while the proper piston bushing eliminates wear on the aluminum part. The vented gas blocks reduce gas sent rearward into the system, providing a smoother shooting experience.
To complete this exceptional package, the BRN-4® Upper Receiver includes a Magpul ejection port cover and a mil-spec charging handle, providing you with everything you need for a seamless shooting experience.
To see the full lineup of BRN-4 kits and parts, visit the BRN-4 page at Brownells. Additonal photos can be found here.
430104761 BRN-4® 10.4″ Assembled Upper Receiver Medium Barrel
430104762 BRN-4® 14.5″ Assembled Upper Receiver Medium Barrel
430104763 BRN-4® 16″ Assembled Upper Receiver Medium Barrel
430104906 BRN-4® 10.4″ Assembled Upper Receiver Heavy Barrel
430104907 BRN-4® 14.5″ Assembled Upper Receiver Heavy Barrel
430104908 BRN-4® 16″ Assembled Upper Receiver Heavy Barrel
About Brownells
Serious About Firearms Since 1939™, Brownells is the world’s leading source for guns, gun parts and accessories, ammunition, gunsmithing tools and survival gear. With a large selection of both common and hard-to-find items, and an extensive collection of videos, articles, and gun schematics, Brownells is the expert for everything shooting-related. Committed to maintaining our great traditions, Brownells has more, does more and knows more – and guarantees it all, Forever. For more information or to place an order, call 800-741-0015 or visit Brownells.com. Stay up-to-date with Brownells on YouTube, Facebook,Twitter and Instagram.
