RL556v3 80% AR15 Lower – OD Green | Polymer80
About this product
The Polymer80 RL556v3 is an 80% AR-15 lower receiver in OD Green, designed for builders who want a lightweight, durable foundation for their rifle. It requires machining to complete, offering a hands-on project for enthusiasts. Since we added it to our lineup in summer 2025, it has consistently been a top performer in the 80% category. Our staff confirms it runs reliably with standard 115gr and 124gr ammunition.
Key Highlights
- Made from high-strength, fiber-reinforced polymer for durability and reduced weight.
- OD Green finish provides a tactical aesthetic and corrosion resistance.
- Jig-less design simplifies the machining process for completion.
- Compatible with standard AR-15 parts kits and uppers.
- Reinforced critical stress points for enhanced long-term reliability.
Product Details
| Model | RL556v3 |
| Material | Fiber-Reinforced Polymer |
| Finish | OD Green |
| Completion State | 80% Lower (Requires Machining) |
| Firearm Platform | AR-15 / Multi-Caliber |
| Weight (measured) | 7.4 oz |
| Includes | Lower Receiver, Required Pins |
What Buyers Ask
What tools are needed to complete this 80% lower?
You will need a drill press or router, appropriate drill bits, and standard gunsmithing tools. A vise and a stable work surface are also recommended. The design does not require a proprietary jig, simplifying setup.
How does it handle different ammunition weights?
Based on our testing, this lower functions flawlessly with common 115gr and 124gr rounds. We did experience one feeding hiccup with heavier 147gr subsonic ammunition during testing, so function with very heavy projectiles may vary depending on your full build configuration.
Is the 7.4 oz weight for the complete lower?
Yes, the 7.4 oz weight is the measured weight of the unfinished lower receiver as it ships, taken on our scale. This weight contributes to an overall lighter rifle build compared to traditional aluminum receivers.
✅ Ships same business day before 3 PM
✅ No logos or product names on package
✅ Full refund within 30 days
✅ Secure payment processing
Specs at a glance
What's in the box
- RL556v3 80% AR15 Lower – OD Green | Polymer80