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The "AR-10" 80% Lower (designed for the LR-308 platform by DPMS) is a step up from the AR-15 platform in performance and capability. By upgrading from 5.56 NATO to .308 Winchester or 7.62x51mm NATO rounds, you'll easily achieve the ability to ring steel out to 700+ yards. The LR-308 lower receiver is the big brother to the 5.56 NATO receiver and packs a bigger punch while allowing you to customize your build from scratch.

Learn how the LR-308 and AR-10 compare, including parts and what to pick.

Installing a .308 parts kit is just like assembling a 5.56 AR! Here's how to do it.

Completing Your Lower Receiver

The 80% lower is a foundation of any custom AR-10-type / LR-308 build. The .308 lower itself is the key to building not only a custom rifle, but also thee route to build a rifle WITHOUT an FFL (Federal Firearm License) transfer or paperwork. According to the ATF and federal law, the 80% lower is not considered a firearm since it is only partially complete. Officially called a receiver blank, the unit requires you, the builder, to finish the last 20% of machining requirements, resulting in a 100% complete, stripped lower receiver. This is accomplished with the help of an AR-10/LR-308 Jig. The jig provides the necessary templates, depth guides, sidewalls, and tooling to get the job done.

State Laws May Vary

Some states have banned 80% lowers and certain firearm parts, or have otherwise restricted the sale and ownership of products we sell. So, be sure to check your local and state laws. We can’t ship our products to certain states. Please check our Shipping & Return Policy before placing an order (see restrictions).

Assembling Your Lower & Final Build

There are countless manufacturers of .308-caliber AR parts on the market today. The AR-10 by ArmaLite is not included within this market. Instead, the LR-308 platform is now the platform of choice. To complete your rifle, we recommend checking out the available build kits which include a ready-to-fire upper, bolt carrier group, lower parts kit, and compatible buffer assembly with buttstock.

LR-308 80% Lower Features:

  • No FFL/serialization required under federal law (state laws vary)
  • No serialization required under federal law
  • Minimal technical skills required to complete
  • Compatible with all DPMS LR-308 components
  • CNC-machined from 6061-T6 billet aluminum
  • Proudly made in the USA

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

Need help buying or building? Our FAQ page covers it all.


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, 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.