This Polymer80 80% Lower Receiver and Jig Kit is for the builder who wants a solid foundation for their .308/7.62x51mm AR-10 platform project. It’s a straightforward, no-frills kit that gets the job done. We added this to our catalog in the fall of 2025, and it’s proven reliable with consistently positive feedback from folks who’ve used it. Our staff’s main takeaway: it’s a drop-in fit on every frame we tested, so you won’t be doing any extra fitting work.
Key Highlights
- Complete kit includes the 80% polymer lower receiver and the necessary jig for completion.
- Designed specifically for the LR-308/AR-10 platform, compatible with DPMS-pattern parts.
- Drop-in fit with standard AR-308 upper receivers—no hand-fitting required per our testing.
- Jig is engineered for use with standard drill press or router tools for a clean finish.
- Provides a lightweight, durable base for your custom rifle build.
Product Details
| Platform | LR-308 / AR-10 (DPMS Pattern) |
| Material | High-Strength Polymer |
| Completion Required | 80% (Fire Control Pocket, Trigger Pin Holes) |
| Jig Type | Multi-use, Router/Drill Press Compatible |
| Weight (measured) | 4.1 oz |
| Color | Black |
| Includes | 1x 80% Lower, 1x Jig, Required Hardware, Drill Bits |
What Buyers Ask
What tools do I need to finish this 80% lower?
You’ll need a standard drill press or a router, a vise to secure the jig, and the included drill bits. The jig guides the process for milling the fire control group pocket and drilling the trigger and hammer pin holes.
Is this compatible with all AR-308 uppers?
This lower is built to the common DPMS pattern. It has shown a drop-in fit with every DPMS-pattern upper we’ve tested it with in our shop. Always confirm your specific upper’s pattern for compatibility.
How does the polymer handle the .308 recoil?
Polymer80 uses a reinforced, high-strength polymer composite designed for the platform. The critical stress points around the buffer tube tower and takedown pins are engineered for durability. It provides a lightweight option that has held up well in builds we’ve seen.
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