Polymer80 LR-308 80% Lower Receiver

If you have been looking for a solid foundation for a custom .308 or 6.5 Creedmoor build, the Polymer80 LR-308 80% Lower Receiver is worth a serious look. This is an unfinished lower that puts the work—and the final decision-making—in your hands. It is built for the builder who wants a lightweight, cost-effective platform without sacrificing the hands-on experience of completing a receiver at home. Whether you are planning a long-range hunting rig or a durable battle rifle, this 80% lower gives you the flexibility to machine the fire control pocket and trigger通道 yourself, right in your own workshop.

Overview

The Polymer80 LR-308 80% Lower Receiver is a polymer-based, uncompleted lower designed specifically for large-frame AR-style builds. Unlike aluminum lowers, this unit is molded from high-impact polymer to keep weight down while still providing the rigidity needed for a .308 platform. It is compatible with most LR-308 and DPMS pattern upper receivers, which means you have a wide range of barrels, handguards, and bolt carrier groups to choose from. Because it is an 80% receiver, it requires you to complete the remaining material removal (typically the trigger pocket and hammer pin holes) using a jig and basic tools. No FFL transfer is needed for the unfinished receiver itself, though you will need to follow all local and federal laws regarding the final build.

Features & Specs

This receiver brings together practical design choices that make assembly straightforward and the final build reliable. The polymer construction reduces overall rifle weight by nearly half a pound compared to standard aluminum lowers, which is a real advantage when you are carrying it through brush or walking a long range. The integrated trigger guard is molded as one piece, saving you from having to install a separate guard. Here are the key specs and features you need to know:

• Manufacturer: Polymer80 | Category: Parts | Platform: LR-308 / DPMS pattern large frame
• Material: High-impact polymer with glass-fiber reinforcement for dimensional stability
• Compatibility: Works with standard LR-308 lower parts kits and most DPMS-spec upper receivers

Additionally, the receiver includes a flared magazine well for faster reloads and a textured grip area that gives you a positive hold even with wet or gloved hands. The bolt catch recess is pre-marked to help you align your jig, and the takedown pin detent holes are already drilled to spec. This is a genuine Polymer80 product, so you know you are getting the same quality control that has made their Glock-style frames so popular.

Who It’s For

This Polymer80 LR-308 80% Lower Receiver is for the home builder who wants a hands-on project with a tangible payoff. It is not for someone looking for a drop-in, ready-to-shoot rifle. You should be comfortable using a drill press or hand drill with a jig, and you need to understand the legal requirements for completing and serializing a firearm in your state. That said, if you enjoy the process of building your own rifle and want to save money by buying an 80% lower instead of a completed receiver, this is a great choice. It is also ideal for shooters who want a lightweight .308 platform for hunting or target shooting without the added cost of a billet aluminum lower. If you have already built an AR-15 lower and are ready to step up to a larger caliber, this is a logical next project.

Shipping & FFL

Because this is an 80% lower receiver—meaning it is not yet a firearm—it ships directly to your home or workshop with no FFL transfer required. No background check, no waiting period, no dealer visit. However, please note that once you complete the machining and turn it into a functional firearm, you are legally required to serialize it if you ever plan to sell or transfer it. Check your state and local laws before ordering. Some states restrict or prohibit 80% receivers, and it is your responsibility to comply. We ship to all states where these receivers are legal, but we cannot ship to P.O. boxes or APO/FPO addresses. Typical shipping takes 3-5 business days via USPS or UPS. If you have any questions about compatibility or the build process, reach out to our support team—we are happy to help you get started on your next project.