Polymer80 AR15 80% Receiver w/ Jig Kit

Build your own custom AR-15 platform from the ground up with the Polymer80 AR15 80% Receiver w/ Jig Kit. This complete kit provides the essential components for hobbyists and gunsmiths who want to mill, drill, and finish a serialized lower receiver to their exact specifications. Engineered for precision and ease of use, this kit combines a durable 80% receiver with a dedicated jig system to streamline the build process. Whether you are a first-time builder or an experienced fabricator, this kit offers a reliable foundation for a fully functional AR-15 pattern rifle.

Overview

The Polymer80 AR15 80% Receiver w/ Jig Kit is a comprehensive build solution that includes an unfinished lower receiver and a reusable jig for drilling and machining. The receiver is constructed from a high-impact polymer blend, providing a lightweight yet robust base for your firearm. The included jig features hardened steel drill bushings and clearly marked indexing points, allowing for accurate hole placement without complex setups. This kit eliminates the guesswork from the build process, enabling you to complete a professional-grade lower receiver in a home workshop environment. When paired with a standard AR-15 upper parts kit, this receiver forms the core of a reliable, semi-automatic rifle.

Features & Specs

This build kit includes the Polymer80 AR15 80% Receiver w/ Jig Kit, which comes pre-formed with critical trigger and hammer pin pockets, safety selector detent channels, and rear takedown pin lug geometry. The jig is designed for compatibility with standard drill presses, hand drills, or milling machines, offering flexibility based on your tooling availability. Below are the key specifications and features of this product.

• Manufacturer: Polymer80 | Category: Build Kits | Material: Proprietary impact-modified polymer composite with fiberglass reinforcement for dimensional stability
• Included components: One unfinished 80% lower receiver, one polymer jig with hardened steel drill bushings, two drill bits (for trigger pin and hammer pin holes), and assembly instructions
• Compatibility: Fits all standard mil-spec AR-15 upper receivers, lower parts kits, and buffer tube assemblies; accepts standard AR-15 magazines and fire control groups

The receiver is pre-machined with a rear pocket that accepts standard AR-15 buffer tubes and stock assemblies. The jig provides precise alignment for drilling the trigger and hammer pin holes, as well as the safety selector detent hole. The polymer construction reduces overall weight compared to aluminum receivers, while maintaining structural integrity for repeated use. The kit requires basic workshop tools such as a drill, vise, and hand files for final finishing.

Who It’s For

The Polymer80 AR15 80% Receiver w/ Jig Kit is designed for firearm enthusiasts who want hands-on control over their AR-15 build. This kit is ideal for individuals who have experience with basic mechanical assembly, including drilling, filing, and fitting parts. It suits gunsmiths looking to produce custom lowers with specific trigger configurations, as well as hobbyists who enjoy the satisfaction of completing a firearm from a partially finished component. The kit is not recommended for users without prior experience using power tools or following detailed technical instructions. First-time builders should consider reviewing additional online guides or videos before proceeding with the machining process.

Shipping & FFL

This product is classified as an 80% receiver and does not require transfer through a Federal Firearms License (FFL) holder for shipment. The receiver is not a firearm as defined by the Gun Control Act of 1968 and may be shipped directly to your residential or business address, subject to state and local laws. It is the buyer’s sole responsibility to verify compliance with all applicable federal, state, and municipal regulations regarding the possession, machining, and final assembly of 80% receivers. Some states, including but not limited to California, New York, New Jersey, Connecticut, and Washington D.C., have specific restrictions on 80% receivers. By purchasing this Polymer80 AR15 80% Receiver w/ Jig Kit, you confirm that you are legally permitted to own and complete this component in your jurisdiction. No FFL is required for this kit; however, once the receiver is fully machined and assembled into a functional firearm, it must comply with all applicable laws concerning serialization and registration, where required. The buyer assumes all legal liability for the completed product.