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If you’ve always wanted to build your own HK416 derivative, Brownells has you covered. Their newly manufactured, assembled BRN-4 uppers are the perfect starting point. These uppers fit on a standard AR-15 lower receiver.
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Unlike the HK416 parts kits previously imported by Brownells, the BRN-4 uppers are all new production. All that these uppers need is a 1/2×28 muzzle device and an appropriate handguard. Any HK416 or MR556 handguard will work, and many options are available from vendors like Geissele and HK Parts. Brownells does recommend an H1 or H2 buffer for use with the BRN-4 uppers, so it is probably a good idea to pick one of those up as well.
There are currently two barrel contours and three barrel length options. The Faxon-made barrels come in a medium or heavy contour. Barrel lengths include 10.4-inch, 14.5-inch, and 16-inch versions. 1-in-7 twist is standard across all models, so 77-grain ammunition will be no problem. All versions of the BRN-4 upper cost $1199.99.
From the manufacturer:
Assembled from All New Components – Fits Standard AR-15 Lowers
The BRN-4® Upper Receiver is now available as an Assembled Upper, with Barrel and Gas System installed. Simply add your preferred HK® 416 compatible handguard and any 1/2-28 muzzle device, and you’re ready to hit the range!
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.
All images from Brownells.
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