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

Overview

For the serious custom builder, the Polymer80 80% lower receiver and jig kit (LR-308) delivers a robust foundation for your large-frame AR platform. This complete kit combines a precision-machined 80% lower receiver with the necessary jig components, allowing you to finish the lower to your exact specifications. Designed for the LR-308 pattern, this kit bridges the gap between raw material and a fully functional firearm component, giving you control over the build process from the ground up. Whether you are assembling a precision rifle or a rugged field gun, this kit provides the structural integrity and modularity required for a reliable large-frame build.

Features & Specs

The Polymer80 80% lower receiver and jig kit (LR-308) is manufactured from high-impact, glass-reinforced polymer, offering a balance of weight savings and durability. The kit includes the 80% lower receiver, a multi-position jig, drill bits, end mill, and all necessary pins and springs. The receiver is designed to accept standard LR-308 parts kits and buffer tubes, simplifying the build process. Critical dimensions are pre-marked for accurate drilling and milling, reducing the margin for error.

• Manufacturer-specified material: glass-reinforced polymer for impact resistance and dimensional stability.
• Includes precision jig system with hardened steel drill bushings for repeatable alignment.
• Compatible with standard LR-308 lower parts kits, trigger groups, and pistol grip configurations.
• Pre-marked trigger pocket, safety selector hole, and buffer tube threading points.

Who It’s For

This kit is intended for experienced firearm builders who possess the necessary tools and skills to complete an 80% lower receiver. It is ideal for those who want to customize their large-frame AR-308 build from the receiver up, selecting each component for performance and fit. The Polymer80 80% lower receiver and jig kit (LR-308) suits builders who prioritize hands-on assembly and want to avoid the restrictions of fully serialized receivers. It is not recommended for first-time builders unfamiliar with drilling, milling, or firearms assembly procedures. Proper safety equipment and a stable workbench are mandatory.

• Experienced hobbyists and custom rifle builders seeking a personalized LR-308 platform.
• Shooters who want to build a dedicated precision rifle or a lightweight hunting setup.
• Individuals who prefer to complete a firearm component without a pre-assigned serial number.

Shipping & FFL

This product is an 80% lower receiver and is not considered a firearm by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) as sold. It may be shipped directly to your residence or business address without the need for a Federal Firearms License (FFL) transfer. However, it is your sole responsibility to verify that possession and completion of this component are legal under all applicable federal, state, and local laws. Some states and municipalities restrict or prohibit the possession or finishing of 80% receivers. By purchasing this item, you certify that you are not prohibited from possessing firearms or firearm components under state or federal law. No FFL transfer is required for this item, but we reserve the right to refuse shipment to jurisdictions where such items are restricted. Check your local laws before ordering.

• No FFL transfer required for the unfinished 80% lower receiver kit.
• Shipped directly to your provided address; signature may be required.
• Buyer assumes all legal responsibility for compliance with local, state, and federal regulations.