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

When you are ready to build a large-frame precision rifle on your own terms, the Polymer80 80% Lower Receiver and Jig Kit (LR-308) provides the foundation for a custom .308 platform without the paperwork associated with a serialized receiver. This kit is engineered for the dedicated builder who values control over every component in their build process. The 80% lower requires finishing work using the included jig, allowing you to complete the frame to your exact specifications. As a commercial-grade component, it supports standard LR-308 and DPMS pattern parts, giving you maximum flexibility for your upper receiver, barrel, and stock choices.

Overview

This Polymer80 80% Lower Receiver and Jig Kit (LR-308) is a complete solution for finishing your own large-frame lower. The kit includes the unfinished polymer lower receiver and the precision-machined jig necessary to complete the trigger pocket, fire control group holes, and pin channels. The LR-308 pattern is widely supported across the industry, making this kit a practical choice for builders who want to assemble a .308 rifle caliber firearm from the ground up. Because the lower is 80% complete, it does not require serialization or transfer through a Federal Firearms License (FFL) dealer at the time of purchase, though certain state and local laws may apply.

Features and Specs

• Includes the Polymer80 80% lower receiver and the dedicated LR-308 jig kit with drill bits and end mill. The jig is reusable for multiple builds, providing ongoing value for your workshop.
• Manufacturer-specified material is high-impact polymer, designed to withstand the recoil forces of .308 Winchester and 7.62 NATO cartridges. The receiver is compatible with DPMS pattern LR-308 parts kits and upper receivers.
• Integrated trigger guard is molded directly into the lower receiver, reducing assembly steps and eliminating the need for a separate trigger guard installation. The magazine well is flared for easier reloading under stress.

This polymer80 80% lower receiver and jig kit (lr-308) is built to the same tolerance standards as factory-completed receivers, ensuring a consistent fit with quality components. The jig system guides your tools precisely, reducing the risk of misalignment during the finishing process. Each kit is inspected prior to packaging to confirm that all necessary tooling and hardware are included.

Who It Is For

This kit is designed for the experienced builder who wants to complete a .308 caliber rifle without the serialization requirements of a finished lower. It is suitable for hobbyists, gunsmiths, and shooters who prefer to hand-select every part of their build. If you have experience with basic tools such as a drill press or hand drill and are comfortable following detailed instructions, this Polymer80 80% Lower Receiver and Jig Kit (LR-308) gives you the platform to create a rifle that matches your specific ergonomic and performance preferences. It is not recommended for first-time builders unfamiliar with finishing 80% receivers, as the LR-308 pattern requires precise alignment and careful work.

Shipping and FFL

Because this item is an 80% lower receiver and jig kit, it is not classified as a firearm under federal law and does not require shipment to a Federal Firearms License (FFL) dealer. We ship directly to your residential or business address within the United States, subject to compliance with all applicable state and local laws. You, the buyer, are solely responsible for verifying that possession and use of this polymer80 80% lower receiver and jig kit (lr-308) is legal in your jurisdiction. Some states and municipalities impose restrictions on the purchase, possession, or completion of 80% receivers. By placing an order, you confirm that you are legally eligible to purchase this product and that you will comply with all local, state, and federal regulations regarding its use and completion. No FFL transfer is required for the initial shipment, but we recommend consulting legal counsel if you have any questions about your local laws.