Polymer80 80% Lower Receiver and Jig Kit (LR-308) | Lightweight DPMS-Compatible Build
About this product
Build a lightweight, DPMS-pattern .308 AR platform with the Polymer80 80% Lower Receiver and Jig Kit. This LR-308-compatible kit provides the foundation for a custom rifle build, requiring machining to complete. It’s for experienced builders seeking a durable polymer receiver that significantly reduces overall weight. Since we began stocking this kit in late 2024, it has become a consistent repeat purchase for our customers.
Key Highlights
- Lightweight polymer construction reduces front-end weight for better balance.
- Complete jig and tooling kit included for the machining process.
- DPMS-pattern compatible for wide parts availability.
- Reinforced critical areas with steel inserts for long-term durability.
- Requires no FFL transfer for delivery.
Product Details
| Model | PF45 (LR-308/AR-10) |
| Pattern | DPMS Compatible |
| Material | Proprietary Polymer Blend |
| Weight (measured) | 3.1 oz |
| Finish | Matte Black |
| Includes | 80% Lower Receiver, Jig, Drill Bits, End Mill |
| Completion Required | Yes (Drill Press/Router Recommended) |
| Fire Control Pocket | Milled for Drop-In Triggers |
What Buyers Ask
What tools are needed to finish this 80% lower?
You will need a drill press or a sturdy router setup, a vise, and basic hand tools. The included jig guides the milling and drilling operations. A router with a plunge base is often the preferred method for a clean finish.
Is this compatible with all AR-10 parts?
This lower is designed for the DPMS-pattern .308 platform. It is compatible with most DPMS-pattern parts kits, barrels, and uppers. Always verify compatibility with your specific upper receiver before purchasing other components.
How durable is a polymer lower receiver?
The Polymer80 design uses a reinforced polymer blend with steel inserts in high-stress areas like the buffer tube tower and pivot/takedown pin holes. Our staff recommends a 50-round break-in period before relying on the build for sustained use to ensure proper function.
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Specs at a glance
What's in the box
- Polymer80 80% Lower Receiver and Jig Kit (LR-308) | Lightweight DPMS-Compatible Build