Description

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

Build a reliable large-frame AR platform on your terms with the Polymer80 80% Lower Receiver and Jig Kit (LR-308). Designed for the serious DIY builder, this kit provides the essential components needed to complete a custom .308 Winchester or 6.5 Creedmoth rifle from an unfinished lower. The polymer80 80% lower receiver and jig kit (lr-308) eliminates the guesswork by combining a precision-molded 80% lower with a dedicated jig system, allowing you to mill, drill, and tap the fire control pocket to ATF-compliant specifications. This kit represents a straightforward path to a fully functional, personally manufactured firearm without the need for a serialized receiver transfer.

Overview

The Polymer80 80% Lower Receiver and Jig Kit (LR-308) is a complete solution for builders who want a durable, lightweight lower receiver for a large-frame AR pattern rifle. The 80% lower is manufactured from high-impact polymer, offering significant weight savings over aluminum while maintaining structural integrity for hunting, competition, or personal defense builds. The included jig system provides precise alignment for drilling the trigger pin, hammer pin, and safety selector holes, as well as milling the pocket for the trigger group. This kit is the foundation for a custom LR-308 that matches your exact ergonomic and performance preferences.

Features & Specs

This kit delivers the critical components for a successful build, with features engineered for accuracy and ease of assembly. The polymer80 80% lower receiver and jig kit (lr-308) is built around a reinforced polymer frame that resists flex under heavy recoil. The jig is reusable and includes hardened steel drill bushings for consistent hole placement.

• Compatible with standard LR-308 (DPMS pattern) upper receivers and parts kits
• Includes one 80% lower receiver, one jig, drill bits, end mill, and instruction manual
• Polymer construction with integral trigger guard and flared magazine well for faster reloads

The jig system features a three-axis clamping design that holds the lower securely during machining. The kit supports both standard and extended takedown pin configurations. All hardware is corrosion-resistant steel.

• Lower receiver weight: approximately 8.5 ounces (empty)
• Jig dimensions: 10 x 4 x 3 inches, fits standard bench vises
• Requires a handheld drill and router or drill press for completion

Each polymer80 80% lower receiver and jig kit (lr-308) is individually inspected for dimensional accuracy. The polymer material is UV-resistant and impact-modified for long service life.

• Accepts all standard LR-308 trigger groups, grips, and stocks
• No serial number required until completed (per ATF rulings)
• Backed by Polymer80’s limited lifetime warranty against manufacturing defects

Who It’s For

This kit is intended for experienced builders and intermediate-level hobbyists who are comfortable using basic power tools. It is ideal for shooters who want a lightweight hunting rifle in .308 Win or 6.5 Creedmoor without the cost of a complete factory firearm. The polymer80 80% lower receiver and jig kit (lr-308) also appeals to those who prefer a non-serialized build for privacy or customization purposes. Beginners with some mechanical aptitude and access to a drill press or router can complete the machining in approximately one to two hours. This product is not recommended for first-time firearm builders without prior experience in AR platform assembly.

Shipping & FFL

This product ships directly to your residence or business address. Because the polymer80 80% lower receiver and jig kit (lr-308) is classified as an unfinished 80% receiver, it is not considered a firearm by the ATF and does not require transfer through a Federal Firearms License (FFL) dealer. No background check is required for purchase. However, once you complete the machining process, you are responsible for complying with all applicable federal, state, and local laws regarding the manufacture and possession of a personally made firearm. It is your responsibility to verify that possession and completion of this kit are legal in your jurisdiction before ordering. We do not ship to states or localities where 80% receivers are restricted or prohibited. By purchasing this product, you confirm that you are legally eligible to own a firearm and that you will comply with all applicable laws.