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LR-308 Jig

LR-308 Jig

An AR-10/LR-308 80% jig is required to cut and drill your LR-308 or AR-10 80% lower receiver, making it ready for assembly. If you bought an LR-308 or 6.5 Creedmoor rifle kit and want to finish your build with a .308 80% lower, these are the jigs you need. To assist with the machining process, every .308 jig comes with easy-to-follow instructions for drilling each pin hole and cutting the fire control cavity. Regardless of the maker, each jig comes with various metal (steel or aluminum) templates with pre-cut holes and shapes for fabricating your receiver. Also included with each jig are the required drill bits for the parts kit's pin holes, and end mill bits for cutting the trigger, hammer, and disconnector cavity.

Read this guide explaining the LR-308 vs. the original AR-10 for more info.

Complete Your .308 Lower Quickly & Affordably

Our AR-10 jigs are designed with first-time builders in mind, so we have built-in safeguards to prevent common errors, drill bit depth guides, a manual and tutorial videos to make the process even easier! With instructions and basic tools in hand, you can confidently complete your AR-10's lower in around one to two hours. These jigs are also built to last! One metal AR-10 jig can easily complete twenty or lowers without having to replace any plates from wear-and-tear. Want to spend as little as possible on your 80 percent lower .308 build? The polymer jig-and-lower combo kits come with both an AR-10 polymer receiver blank, the jig, and the bits!

Want to learn more about how jigs work? Read the in-depth jig guide.

LR-308 / AR-10 Jig Features:

  • No FFL required! 
  • Jigs are reusable (20+ 80% Lowers) 
  • Made of steel, aluminum, or polymer 
  • Compatible with AR-10 / LR-308 lower receivers
  • Built-in safeguards and easy-to-follow instructions
  • Proudly made in the USA 

Execute the right to bear arms today. Your build awaits you.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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.