Description

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

If you are looking to build a large-frame AR from the ground up, the Polymer80 80% lower receiver and jig kit (LR-308) is one of the most practical starting points on the market. This kit delivers the same hands-on building experience that made Polymer80 famous, now scaled up for a .308 platform. Whether you are a first-time builder or a seasoned gunsmith, this kit gives you the raw materials and the tooling to finish a serial-number-free lower receiver at home. We stock this kit because it consistently delivers clean results without requiring a full machine shop.

Overview

This Polymer80 80% lower receiver and jig kit (LR-308) is designed for the LR-308 pattern large-frame AR. The kit includes the unfinished 80% lower receiver, a dedicated jig, drill bits, end mill, and all necessary pins and hardware. The lower is molded from a reinforced polymer that holds up well under the recoil of .308 Win and 6.5 Creedmoor. The jig is a reusable polymer unit that indexes directly off the receiver, so you can complete the pocket and trigger hole with a standard hand drill and a router. It is a complete package: no separate jig purchase required.

Features & Specs

• Material: Impact-resistant, glass-reinforced polymer. Lighter than aluminum but structurally sound for a .308 build. The fire control pocket is reinforced with steel inserts at the trigger pin and hammer pin locations.
• Compatibility: Fits DPMS-pattern LR-308 upper receivers. Works with standard AR-308 lower parts kits and buffer tubes. Uses standard SR-25 pattern magazines.
• Kit Contents: 80% lower receiver, jig, 2 drill bits, 1 end mill, trigger pin, hammer pin, takedown pin set, and installation hardware. The jig is reusable for multiple builds.

Who It's For

This kit is for the builder who wants to complete their own LR-308 lower without a serial number. It is ideal for hobbyists who already own a drill press or a handheld router and want a straightforward weekend project. The Polymer80 80% lower receiver and jig kit (LR-308) is also a solid choice for anyone who prefers a polymer lower for weight savings on a large-frame rifle. It is not recommended for complete beginners who have never worked with a jig before, but if you have basic tool experience and can follow a video guide, you will be fine. This is a hands-on project, not a drop-in part.

Shipping & FFL

Because this is an 80% lower receiver, it is not considered a firearm by the ATF. It ships directly to your door with no FFL transfer required. No background check, no waiting period, no dealer visit. The jig and tooling are included in the same box. Shipment is via UPS Ground with adult signature required. We ship to all US states except California, New York, New Jersey, Connecticut, Massachusetts, Rhode Island, Delaware, Washington D.C., and Hawaii. Local laws vary, so check your state and municipal regulations before ordering. By purchasing this Polymer80 80% lower receiver and jig kit (LR-308), you certify that you are not prohibited from possessing firearms and that you will complete the receiver in compliance with all applicable laws.