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The Rock River Arms BB0470 LAR-15M RRAGE 3G Complete Upper is a ready-to-run upper receiver assembly built for shooters who want quality components and modern ergonomics without the build headache. Chambered in 5.56x45mm NATO and built on an extruded aluminum receiver, this complete upper comes fully assembled with a bolt carrier group and charging handle—just add your lower and you're on the line. It's designed for shooters and hunters who value reliability and modularity in a carbine-length platform.
The barrel is cold hammer-forged chrome moly steel, a proven material for longevity and accuracy under sustained fire. The 15-inch RRAGE 3G M-LOK handguard gives you plenty of real estate for mounting lights, grips, or slings while keeping the gun balanced and controllable. The A2 flash hider is a time-tested muzzle device that reduces visible muzzle flash—handy whether you're at the range or hunting in low light. This upper ships with no forward assist, a choice that keeps things lightweight and lets the mass of your bolt carrier group handle lock-up reliably.
Rock River Arms has been making AR platform uppers long enough to know what works. The port door on the aluminum receiver makes brass ejection and cleaning straightforward. Whether you're building a mid-length rifle for 3-gun, a hunting carbine, or a dependable 5.56 for the range, this complete upper takes the guesswork out of component matching and gets you shooting fast.
| Caliber | 5.56x45mm NATO |
| Barrel Length | 16 inches |
| Barrel Material | Chrome Moly Steel (Cold Hammer-Forged) |
| Upper Receiver | Extruded Aluminum |
| Handguard | 15" RRAGE 3G M-LOK |
| Muzzle Device | A2 Flash Hider |
| Forward Assist | None |
| Configuration | Complete Upper Assembly (includes BCG and charging handle) |
| Finish | Black |
| Manufacturer | Rock River Arms |
| Model | BB0470 LAR-15M RRAGE 3G |
This is a standard AR-15 pattern upper and will fit any AR-15 lower receiver. Make sure your lower is chambered to accept 5.56x45mm NATO to match this upper.
Yes—this is a complete upper assembly that includes the bolt carrier group and charging handle. You'll need to pair it with an AR-15 lower receiver assembly to have a functioning rifle.
Yes. The 15-inch RRAGE 3G handguard is M-LOK compatible, so you can attach any M-LOK accessories like lights, grips, sling mounts, or bipods to customize your rifle.
The forward assist is a feature that helps lock the bolt in battery. This upper is designed without one, keeping the design lighter and simpler while relying on the momentum of the bolt carrier group to seat the round properly under normal shooting conditions.
SKU: 126512023 • Width: 5.75in • Height: 5.5in • Depth: 32.25in • Weight: 5.88oz