Polymer80 LR-308 80% Lower Receiver

The polymer80 lr-308 80% lower receiver is a solid starting point for builders who want a lightweight, large-frame AR platform without the paperwork hassles of a completed receiver. This 80% lower gives you the freedom to finish the fire control cavity and trigger channel at your bench, turning raw polymer into a functional LR-308 lower. Polymer80 is known for their attention to ergonomics and tool-free jig systems, and this receiver continues that tradition. Whether you are a first-time 80% builder or a seasoned hobbyist, this lower offers a clean canvas for a custom .308 or 6.5 Creedmoor build.

Overview

This polymer80 lr-308 80% lower receiver is designed to accept standard LR-308 and DPMS pattern upper receivers and parts kits. The polymer construction keeps weight down without sacrificing the rigidity needed for a large-frame rifle. The receiver comes with a molded-in rear takedown pin detent channel and a reinforced buffer tube tower to handle the recoil of full-power cartridges. Pre-indexed jig pin holes and a clearly defined fire control pocket make the finishing process straightforward, even for someone who has only completed AR-15 lowers before.

Features & Specs

• Material: High-impact, glass-reinforced polymer that resists warping and holds tight tolerances around the trigger and hammer pin holes.
• Compatibility: Designed for LR-308 and DPMS pattern large-frame uppers, buffer tubes, and lower parts kits. Not compatible with AR-10 patterns from ArmaLite or other proprietary designs.
• Jig Support: Works with Polymer80’s dedicated LR-308 jig system (sold separately) that uses a simple hand drill and end mill to complete the fire control pocket. No CNC or router required.

Additional specs include a flared magazine well for faster reloads, an integral trigger guard to eliminate a separate installation step, and a textured grip area for a secure hold in wet or gloved conditions. The receiver is marked with engraved safety and fire selector indicators, making final assembly and function checks easier.

Who It’s For

This polymer80 lr-308 80% lower receiver is ideal for the hands-on builder who wants a lightweight hunting or precision rifle without the cost of a fully assembled firearm. It suits anyone comfortable with basic shop tools—a drill press or hand drill and a steady hand—who wants to learn the mechanics of an LR-308 platform. It is also a great choice for shooters who prefer to keep their build off the books, as an 80% receiver is not serialized and does not require an FFL transfer until it is completed. If you already have a Polymer80 jig for AR-15 lowers, the LR-308 version requires a different jig, but the process is nearly identical. Experienced builders will appreciate the polymer’s reduced weight for a pack rifle, while newcomers will find the indexed pocket and clear instructions reduce the learning curve.

Shipping & FFL

This polymer80 lr-308 80% lower receiver ships directly to your door with no FFL transfer required because it is not a firearm under federal law. No background check, no paperwork, no waiting period. You must be 18 years or older to purchase. Once you complete the receiver by machining the fire control pocket and trigger slot, it becomes a firearm under the Gun Control Act. At that point, you are legally responsible for complying with all state and local laws regarding possession and use. Some states—such as California, New York, New Jersey, Connecticut, Rhode Island, Delaware, Washington, Hawaii, and the District of Columbia—restrict or prohibit the sale or possession of 80% receivers. Check your local statutes before ordering. We do not ship to states or municipalities where 80% receivers are banned. By purchasing, you confirm you are legally allowed to own and complete this receiver.