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Brownells BRN-180® Gen 3 Upper Receivers

one year ago

BRN-180® GEN3 -
MODERN PISTON PERFORMANCE. BUILT DIFFERENT.

The BRN-180 Gen 3 brings short-stroke piston operation, bufferless architecture and modern controls together in one versatile upper receiver system.

Its self-contained bolt-carrier assembly eliminates the need for a traditional AR-15 buffer tube, opening the door to compact builds and folding-stock configurations. Better yet, the BRN-180 Gen 3 remains compatible with standard mil-spec AR-15 lower receivers.

Whether you’re building a compact 300 Blackout or a full-size .223 Wylde rifle, the Gen 3 gives you a feature set designed around reliable operation, intuitive handling and adaptability.

The BRN-180® Gen 3 upper is available in 16" or 13.9" barrels chambered for .223 Wylde, or go compact with a 9" barrel in 300 Blackout. Precision and performance, tailored to your build.

When you pick up a BRN-180 Gen3 upper, the first thing you'll notice when you reach for the charging handle to check the chamber is.... there's no charging handle. Actually, there is, but we've moved it to the left side of the receiver. It is now non-reciprocating, so you don't have to worry about a mass of metal flying back and forth close to your face while you're shooting. The slot it rides in is sealed by a rubber gasket, so the handle moves freely but the interior of the receiver is protected from incursion of dirt, dust and debris. The quirky old "dogleg" charging handle is replaced by a more streamlined, ergonomic handle that angles downward to provide more clearance around your optic's objective bell.

When you pull back on that charging handle with the BRN-180 upper separated from the lower receiver, you will NOT get the surprise most of us got the first time we did that with a 180 upper. The guide assembly will not come shooting out the back of the receiver due a new retention system. When it's time to remove the rods and bolt-carrier assembly for cleaning, a quick push of the button lets you remove the assembly - no surprises!

Back on the right side, things are even more different. An AR-15 style shell deflector has been added just behind the ejection port. The traditional flip-up ejection port cover has been replaced by a cover that's attached to the carrier. When the bolt-carrier assembly is in battery, the ejection port is sealed. As the carrier moves back, the "automatic" port cover opens to allow the spent shell to depart. Then it seals right back up. All of this means the interior of the Gen3's receiver is superbly protected against incursion of external dust, dirt, or other debris.

Up front, we’ve made the switchable gas system even easier to use. You reach through an opening in the handguard and flip the lever to one of three gas flow settings for the .223 or one of four settings for the 300 Blackout. Position 1 for suppressed loads, position 2 for normal operation unsuppressed, position 3 for adverse conditions. The 300 Blackout adds a fourth position for the most adverse conditions like heavy unsuppressed subsonic bullets in 300 Blackout. If you employ a far forward support hand position, your hand or wrist can be taking some of that gas blast. We've blanked off the surrounding area on the handguard with solid metal to deflect that venting gas.

We've just touched the highlights here. Read below for a full rundown of the upgrades we've made to the BRN-180 Gen3!

BRN-180^® Gen3 Upper Receiver Features

Nonreciprocating left-sided charging handle:

Keep your firing hand where it belongs. The left-side charging handle is easy to reach with the support hand and remains stationary while firing. Its downward angle also provides useful clearance around mounted optics.

Improved Charging Handle Ergonomics:

The handle now angles downwards, so it's easy to grasp without having to wrangle your hand around your optic. This also makes manually locking back the bolt much easier.

Sealed Receiver Slot:

A gasket seals the charging-handle slot, while the carrier-mounted ejection-port cover closes with the action. Together, they help keep dirt, dust and debris outside the receiver where they belong.

Automatic Ejection Port Cover:

We've replaced the AR-15 type cover with a cover attached to the bolt-carrier assembly that cycles with the action and seals the gap behind the carrier when the bolt is forward. You never have to manipulate it yourself.

Easy-Adjust Gas System:

Tune the BRN-180 Gen 3 to the way you shoot with an easy-to-access gas adjustment lever. Select settings for suppressed, normal or adverse operation without reaching for a tool. 300 Blackout models provide an additional setting for demanding ammunition and operating conditions.

Anti-Bounce Bolt-Carrier Upgrade:

The carrier is engineered to resist bolt bounce as it goes into battery, helping promote consistent lockup and dependable ignition.

What makes the BRN-180^® Gen3 Uppers Different?

Enhanced Reliability:

Upgraded guide rod springs and anti-bounce system on bolt for reliable cycling with heavy carbon fouling. Interior of receiver better sealed from outside dust, dirt, and debris for better dependability in adverse operating environments.

Improved Ergonomics:

Charging handle more conveniently located on the left side, easier to operate, and safer because it does not reciprocate during the firing cycle.

Simplicity Reliability:

Simple two-piece operating system replaces the AR-15's gas tube with a piston and an op rod. Fewer parts means fewer failure points and easier disassembly for cleaning. Minimal added weight over a standard AR-15.

Ultra-Easy, Fast Gas Flow Control:

Dirt simple to change gas flow rate with a flip of a lever. No tools needed. Gas system is easy to disassemble for cleaning, making you more likely to do it.

Improved Accessory Mounting:

This solid accessory mounting platform is now EVEN solider with the extended handguard attachment surface on the barrel nut. Plus, more convenient, versatile sling mounting options with QD sockets at the rear of the handguard.

"Sproing!" Surprise Eliminated:

Guide rod/recoil spring assembly now has a retention system so it no longer flies out the back of the receiver when the receiver is tilted open on the pivot pin or removed from the lower receiver.