Polymer80 AR15 80% Receiver W/ Jig Kit

If you are looking to build a custom AR-15 from the ground up, the Polymer80 AR15 80% Receiver w/ Jig Kit is one of the most practical starting points on the market. This kit gives you the freedom to mill your own lower receiver at home, with a complete jig setup that removes most of the guesswork. Whether you are a first-time builder or a seasoned hobbyist, this kit delivers a straightforward path to a fully functional, serial-number-free firearm.

Overview

The Polymer80 AR15 80% Receiver w/ Jig Kit is designed for hands-on builders who want control over their firearm’s fit and finish. The receiver is molded from high-impact polymer, offering a lightweight alternative to aluminum without sacrificing structural integrity. The included jig and tooling allow you to complete the receiver using basic power tools, making it accessible for anyone with a drill and a steady hand. This kit is a complete solution: you get the unfinished lower, the jig, drill bits, end mill, and all necessary hardware to finish the 80% receiver at home.

Features & Specs

This kit is built around the Polymer80 PF940v1 platform, which is compatible with standard AR-15 upper receivers and lower parts kits. The jig is precision-machined to guide your drill and router, ensuring accurate pocket cuts and pin holes every time.

• Includes the Polymer80 80% lower receiver, universal jig, drill bits, end mill, and all pins and springs needed for completion.
• Accepts standard AR-15 lower parts kits, buffer tubes, and pistol grips for full customization.
• Reinforced polymer construction with stainless steel trigger pin inserts for extended durability under heavy use.

The receiver itself is compatible with both mil-spec and aftermarket AR-15 components. The jig is reusable, so you can build multiple lowers with the same setup. The kit also includes detailed instructions and a template for marking your cuts, which reduces the chance of errors during the machining process.

• Compatible with 5.56 NATO and .223 Remington calibers when paired with a standard AR-15 upper.
• Integrated trigger guard and flared magazine well for easier reloads and a cleaner look.
• Textured grip panels and front and rear takedown pin detent channels pre-formed for convenience.

Who It’s For

The Polymer80 AR15 80% Receiver w/ Jig Kit is ideal for the DIY firearm enthusiast who values hands-on craftsmanship. If you enjoy customizing every aspect of your rifle, from the trigger pull to the stock length, this kit puts you in the driver’s seat. It is also a solid choice for builders who want to keep a dedicated lower for a specific upper receiver, or for those who simply appreciate the satisfaction of completing a firearm from an unfinished blank.

This kit is also well-suited for preppers and hobbyists who want to stockpile components for future builds. Because the receiver is an 80% blank, it does not require an FFL transfer at the time of purchase, making it a convenient option for those who want to keep their build options open. Beginners will find the included jig and instructions forgiving, while experienced builders will appreciate the reduced setup time compared to finishing an aluminum lower.

• Best for DIY builders who want a lightweight, polymer-based lower receiver.
• Suitable for those who prefer to avoid FFL transfers during the purchasing process.
• Perfect for builders who want a reusable jig for multiple projects.

Shipping & FFL

Because this item is classified as an 80% receiver, it is not considered a firearm under federal law and does not require an FFL transfer to ship. We ship this kit directly to your doorstep, no dealer involvement needed. However, once you complete the receiver, it becomes a firearm under federal regulations. You are responsible for ensuring that your finished build complies with all local, state, and federal laws. Please check your state and local regulations before purchasing, as some jurisdictions may restrict the possession or completion of 80% receivers. We recommend consulting with a qualified legal professional if you have any questions about the legality of finishing this receiver in your area.