Build Your Own Custom AR-15 with the Polymer80 80% Lower Receiver and Jig Kit
Take control of your firearm build with the Polymer80 AR-15 80% Lower Receiver and Jig Kit. This innovative kit allows you to legally create a personalized AR-15 lower receiver from an 80% unfinished state, offering unparalleled customization and satisfaction. Ideal for gunsmiths, hobbyists, and responsible gun owners, it provides a hands-on experience while ensuring compliance with regulations. At Republic Arms WA, we’re committed to supplying quality components for your DIY projects.
Key Features and Benefits
- 80% Lower Receiver: Made from durable polymer, lightweight yet strong, designed for easy finishing with basic tools like drills and milling machines.
- Included Jig Kit: Precision-engineered jig ensures accurate drilling and milling, reducing errors and saving time during the build process.
- Legal Compliance: As an unfinished receiver, it requires no FFL transfer, making it accessible for home builds while adhering to federal and state laws.
- Customization Potential: Finish the receiver to your specifications, allowing for unique engravings, colors, or modifications to match your AR-15 build.
- Cost-Effective Solution: Avoid high costs of completed lowers by doing it yourself, with this kit providing all essentials in one package.
Why Choose This Polymer80 Kit?
Polymer80 is a trusted brand in the firearms community, known for high-quality polymer receivers that balance durability and weight. This kit simplifies the build process with a user-friendly jig, making it suitable for both beginners and experienced builders. By completing the lower yourself, you gain a deeper understanding of your firearm’s mechanics and can tailor it to your exact needs, whether for sport shooting, hunting, or personal defense.
Specifications and Technical Details
| Material | High-Strength Polymer |
| Compatibility | Standard AR-15 Parts and Calibers |
| Finish | 80% Unfinished (Requires Drilling/Milling) |
| Included Components | 80% Lower Receiver, Jig, Drill Bits, Instructions |
| Weight | Approx. 0.5 lbs (Receiver Only) |
| Brand | Polymer80 |
How to Use This Kit
Start by securing the jig around the receiver, then use the provided drill bits to create necessary holes. Follow the step-by-step instructions for milling the fire control group pocket. With basic tools and patience, you’ll have a functional lower receiver ready for assembly with upper receivers, triggers, and other AR-15 components. Always prioritize safety and consult local laws before beginning your build.
Why Buy from Republic Arms WA?
FAQ: Why should I purchase this kit from Republic Arms WA? We offer expert guidance, fast shipping, and a commitment to customer satisfaction. Our team is knowledgeable about firearm builds and can provide support for your project. Plus, we ensure all products meet quality standards, giving you peace of mind with your purchase.
Image Gallery

| Material | High-Strength Polymer |
| Compatibility | Standard AR-15 Parts and Calibers |
| Finish | 80% Unfinished (Requires Drilling/Milling) |
| Included Components | 80% Lower Receiver, Jig, Drill Bits, Instructions |
| Weight | Approx. 0.5 lbs (Receiver Only) |
| Brand | Polymer80 |





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