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How-To’s, Product Reviews, and more!

Posted by Modulus Arms Product Team on 14th Apr 2025

Billet Design Flexibility Explained

Billet Design Flexibility Explained Modulus Arms has been a leader in 80 lower jig development and router-based tooling since 2014. A 6061 billet 80 lower listing usually describes a receiver blank ma …

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New Package: Ultimate Builder's Kit

Posted by Modulus Arms on 1st Dec 2014

New Package: Ultimate Builder's Kit

The Modulus Arms Ultimate Builder's Kit includes everything needed to get into 80 percent AR-15 and AR-308 rifles. Each of our Universal Jigs are included in the package, with which multiple lowers ca …

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