RL556v3 80% AR15 Lower – Gray | Polymer80
About this product
The Polymer80 RL556v3 is a gray 80% AR-15 lower receiver for builders who want a lightweight, durable foundation for their rifle. It requires machining to complete, offering a project for enthusiasts. Since we added it to our lineup in summer 2025, it has consistently been a top performer in its category. This lower provides a solid, polymer-based platform that balances strength and reduced weight.
Key Highlights
- Constructed from high-strength, reinforced polymer for durability and impact resistance.
- Lightweight design reduces overall rifle weight without sacrificing structural integrity.
- Compatible with standard AR-15 parts kits and upper receivers for straightforward assembly.
- Gray finish provides a clean, neutral base for various build themes and color schemes.
- Includes necessary jig components for precise machining during the completion process.
Product Details
| Model | RL556v3 |
| Material | Reinforced Polymer |
| Color | Gray |
| Completion Status | 80% Lower (Requires Machining) |
| Firearm Platform | AR-15 / Multi-Caliber |
| Weight (measured) | 1.8 oz |
| Includes | 80% Lower, Jig, Drill Bits |
What Buyers Ask
What tools are needed to finish this 80% lower?
You will need a drill press or router, a vise, and standard drill bits. The included jig guides the milling and drilling process. Basic machining knowledge is required to complete the fire control group pocket and trigger pin holes.
Is there a break-in or function check recommended?
Our staff advises a function check with 50 rounds after assembly before considering the firearm for any serious use. This ensures all components are operating correctly and allows you to verify the integrity of your build.
Does this work with standard AR-15 parts?
Yes. The RL556v3 is designed to accept mil-spec AR-15 lower parts kits, pistol grips, buffer tubes, and uppers. It follows the standard dimensions for compatibility.
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Specs at a glance
What's in the box
- RL556v3 80% AR15 Lower – Gray | Polymer80