BROWNELLS - BRN-4® UPPER RECEIVER ASSEMBLIES WITH CHROME LINED BARRELS

BRN-4® UPPER RECEIVER ASSEMBLIES WITH CHROME LINED BARRELS

Assembled from All New Components – Now with Chrome Lined Barrels. 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!

Available in barrel lengths of 10.4, 13.7, 14.5, and 16 inch, these upper receiver groups are suitable for any need. Also available in standard and heavy profiles.

Chrome lined bore and chamber of these barrels has been the go-to for hard use rifle barrels for decades, and you will be extremely pleased with the smooth and crisp application by Faxon in these bores. The chrome is well applied, and just extends over the crown of the barrel and the edge of the chamber. These medium profile barrels are made by Faxon, who button rifles from 4150 chrome moly steel, the top choice for hard use barrels. The 1-7 twist accommodate heavy projectiles and the barrels feature ½-28 muzzle threads for the attachment of the muzzle device of your choice. A matte black phosphate provides a corrosion resistant exterior.

Built from the ground up, the core of the BRN-4® Upper Receiver is an all new Bolt Carrier Group, featuring a phosphate carrier and a chrome bolt. 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.

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.

Muzzle devices installation is straightforward, as the barrel is 1/2-28 and the BRN-4 upper is compatible with common upper receiver “rods” and jigs. Any AR-15 1/2-28 muzzle device will be compatible.

Brownells recommend H1 or H2 recoil buffer with carbine recoil spring for optimal operation.