Brownells Brn-16A2 5.56X45 Nato 20'' Bbl Upper Receiver

The Brownells BRN-16A2 upper receiver is a faithful reproduction of the classic M16A2 profile, chambered in 5.56x45 NATO and topped with a 20-inch barrel. This is the upper half that gives your AR build its soul—precision-machined, reliable, and purpose-built for shooters who appreciate the proven ergonomics and handling of a rifle that defined a generation. Whether you're assembling a retro-correct build, setting up a range rifle, or restoring historical accuracy to your collection, the BRN-16A2 delivers authentic A2 geometry without compromise.

The 20-inch barrel strikes the balance that made the A2 legendary: enough velocity for 5.56 ballistics out to practical hunting and defensive distances, paired with a length that's handy in the field or on the bench. The upper receiver itself is the foundation of your rifle—it houses the barrel extension, bolt carrier guide, and gas tube, and it's where your barrel and BCG come together. Brownells' reputation for dimensional accuracy and fit means you can count on this upper to function reliably with standard AR components.

This is a shooter's choice for anyone building an AR that does real work: hunters who trust the A2 profile, competitors running retro classes, and tinkerers who want the real thing. The 20-inch barrel length gives you the velocity and sight radius the A2 was designed around, and the authentic profile is instantly familiar to anyone who's shouldered a service rifle.

Specifications

Frequently Asked Questions

What do I need to complete this upper receiver into a rifle?

The upper receiver is one half of an AR build. You'll need a lower receiver to mate it with, plus a bolt carrier group and charging handle to function the action. A complete lower receiver includes the trigger group, magazine well, and stock assembly. Once paired, you'll have a complete rifle ready for the range or field.

Will this upper work with standard AR parts?

Yes. The BRN-16A2 is built to AR-15 specifications and is compatible with standard AR components, including commercially available BCGs, charging handles, and handguards designed for A2-profile uppers.

Is this a retro A2 or a clone?

The Brownells BRN-16A2 is a modern reproduction designed to replicate the geometry and function of the original M16A2 military rifle, with the classic 20-inch barrel and A2 flash hider profile. It's purpose-built for authentic A2 builds.