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80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states.
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We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum.
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We also offer our patented AR-15 and .308 Easy JigsĀ® which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower in under 1 hour with no drill press required.
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Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. We will promptly replace or repair any product that we determine to be defective.
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How To: Installation Instructions and Product Manuals

 Important Update Regarding ATF Regulations and Easy Jig Sales

Due to recent changes in ATF regulations, 80% Arms can no longer sell or support jigs directly.

Support and Warranty Service: For all Easy Jig customers, modulusarms.com will now handle support. Modulus Arms will honor warranty services, provide technical support, and offer replacement tools and parts for all Easy Jig products.

Manufacturing and Sales: While Easy Jigs will continue to be manufactured by 80% Arms, all sales must now be conducted through our independent dealers to comply with the new regulation. We are no longer permitted to sell jigs or distribute manuals via our website under these new ATF rules.

Legal Challenges: We are actively challenging this government overreach in court. We are optimistic about a favorable ruling from the Supreme Court in 2024, as both the District Court and the 5th Circuit Court of Appeals have ruled decisively in our favor.

Availability through Dealers: In the meantime, our jigs are still available through our dealers, despite our inability to sell them directly.

We appreciate your understanding and continued support during these changes.