Golden Eagle 13" KeyMod Polymer Upper Receiver, Black

The Golden Eagle 13" KeyMod Polymer Upper Receiver is what you reach for when you're building a gas blowback rifle from scratch or replacing a worn-out upper. It mates with Golden Eagle's polymer lower receivers to complete a functional gas gun platform. This is a parts-level purchase, not a ready-to-shoot rifle—you'll need the matching lower, a gas source, and the usual accessories to get it running.

What's actually in the box. You're getting the upper receiver assembly with a full metal outer barrel and polymer construction. The 21.5" overall length includes the barrel and handguard. At 1.95 lbs, it's light enough that the finished rifle won't feel front-heavy, but the metal barrel adds some heft compared to all-polymer builds.

Rail system. The top of the handguard has a Weaver/Picatinny rail for mounting optics. This is standard for gas gun uppers, so most airsoft scopes and red dots will attach directly without adapters.

Compatibility is specific. This upper is designed for Golden Eagle polymer lower receivers. It won't mate with an M4-style lower or an AK platform. If you're building a Golden Eagle GBBR, this is the matching upper. If you're replacing a damaged upper on an existing Golden Eagle gas gun, verify your lower is the polymer version before ordering.

Adjustable hop-up is included. The hop-up chamber lets you dial in backspin for different BB weights. This isn't a fixed hop-up—you'll need to tune it once you have the full rifle assembled and can test at the chrono station. The hop-up adjustment is part of what makes a gas gun accurate at range, not just the barrel length.

Before you buy. This is an upper receiver only. The package does not include a lower receiver, trigger group, bolt carrier, gas system, or magazine. You'll need to source those separately if you're building from parts. The rail system is Weaver/Picatinny on top, so standard airsoft optics mount directly. Battery and charger are not applicable—this is a gas platform, not an AEG.

Color:

Black

Compatibility:

Golden Eagle Polymer Lower Receivers

Hop-Up:

Yes - Adjustable

Length:

21.5" in.

Material:

Polymer Receiver / Metal Barrel & Rail System

Package Includes:

Upper Receiver

Rail Type:

Weaver/Picatinny

Weight:

1.95 lbs