Polymer80 80% Lower Receiver and Jig Kit (Lr-308)

If you are looking to build a large-frame AR platform on your own terms, the Polymer80 80% lower receiver and jig kit (LR-308) is the starting point that gives you both flexibility and control. This kit is designed for builders who want a .308-caliber rifle without the hassle of a full serialized receiver, and it comes with the essential jig to help you get the job done right. Whether you are an experienced hobbyist or stepping up from smaller AR builds, this kit offers the same hands-on approach that Polymer80 is known for, now scaled for the LR-308 platform.

Overview

The Polymer80 80% lower receiver and jig kit (LR-308) is a complete package that includes the unfinished lower receiver and the dedicated jig needed to complete it. Unlike a standard stripped lower, this 80% receiver requires you to finish the fire control pocket, trigger pin holes, and other critical features using the included jig and basic tools. The kit is built around the LR-308 pattern, which means it is compatible with DPMS-style upper receivers and parts kits. For anyone who values the process of building their own rifle, this is a solid foundation that puts the work in your hands without requiring a full machine shop.

Features & Specs

• Manufacturer: Polymer80; Category: Build Kits; designed specifically for the LR-308 large-frame platform
• Includes the 80% lower receiver and the proprietary jig system with drill bits and end mill bits for completing the fire control group pocket
• Constructed from impact-resistant polymer that is lighter than aluminum while still providing a durable build platform

The jig included in this Polymer80 80% lower receiver and jig kit (LR-308) is a key component. It securely holds the receiver in place and guides your drill press or router to create precise cuts. The receiver itself is pre-marked with reference points, so you can work through the process step by step. Keep in mind that this is a raw 80% lower, so it requires finishing before it is ready for assembly. The kit does not include a lower parts kit, buffer tube, or stock. You will need to source those separately based on your build preferences.

Who It’s For

This kit is for the builder who wants a large-frame AR without the paper trail of a serialized receiver. It is ideal for anyone comfortable with basic tools like a drill press or a router and who has some experience with firearm assembly. The Polymer80 80% lower receiver and jig kit (LR-308) is a good fit if you have already built a smaller AR and want to step up to a .308 platform, or if you are simply looking to start a new project with a hands-on approach. It is not for beginners who have never worked with an 80% receiver before, as the LR-308 pattern requires a bit more attention to fitment and tolerance than a standard AR-15. But if you are ready to learn and take your time, this kit gives you a solid start.

Shipping & FFL

Because this is an 80% lower receiver and not a finished firearm, it does not require transfer through a Federal Firearms License (FFL) dealer for shipment. The Polymer80 80% lower receiver and jig kit (LR-308) can be shipped directly to your door in most states where such kits are legal. However, you are responsible for knowing and complying with all local, state, and federal laws regarding the possession and completion of 80% receivers. Some states and localities have restrictions on unfinished receivers, so please verify your local regulations before ordering. Once completed, the firearm is not serialized by the manufacturer, but you should check your state laws regarding serialization requirements for homemade firearms. We ship this kit via standard ground carriers and cannot ship to P.O. boxes in some cases. If you have questions about your specific jurisdiction, contact us before placing your order.