BROWNELLS - BRN-4® UPPER RECEIVER ASSEMBLIES

BRN-4® UPPER RECEIVER ASSEMBLIES

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 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.

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.

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 recommends H1 or H2 recoil buffer with carbine recoil spring 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.