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Broken Arms 80% Lower Jig - AR15/AR9 (With Tooling)

Usually ships the same day or the next business day!

You love building guns. By now, you no doubt know about building an AR from scratch using little more than a drill press. This is the kit you'll need to get it done: The Broken Arms 80% Jig is designed to eliminate the need for any sort of expensive equipment like a router or mill. It uses unique templates that allow you to fabricate any mil-spec AR-15's forged or billet 80% lower or any mil-spec AR9 80% receiver with nothing more than a drill press and vise.

How the Broken Arms Jig Works

Rather than side-load your tooling like a router or mill requires, the Broken Arms Jig takes a vertical approach to cutting the receiver for the lower parts kit. Using the drill bits, you’ll finish out the entire rear shelf and main fire control cavity for the hammer, trigger, and safety. The jig tells you how far to drill; all you need to do is work the press. You’ll use the end mill bits only for trimming up the receiver’s walls and cutting a slot for the trigger.

It’s All in The Bits

The secret to the Broken Arms Jig isn’t just the templates and guides. The included bits are made from quality high-speed steel (HSS). These are commercial-grade bits that can eat through forged aluminum in seconds, making fabricating multiple receivers as quick as it is simple.

What’s Included

  • (2) Side plates with drill bushings
  • (5) Template plates for fabrication
  • (4) ¼-20 x ¾” jig fasteners
  • (2) ¼-20 x 2 jig fasteners
  • (1) Set of drill bits
  • (1) Set of end mill bits

What’s Required

  • Drill Press
  • Drilling Vise
  • Machining Oil
  • Eye Protection
  • Ear Protection

With your receiver fabricated, you can install a lower parts kit and buttstock or brace, throw on an upper receiver of your choice, and hit the range in one day.

WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to:

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

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Broken Arms

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.