Billet 80 Lower
The billet 80% lower is the easiest and most popular way to build an AR15 at home, legally, unregistered. If you’re on the fence, here’s why you should consider this option over a "retail-bought" stripped receiver:
- You don’t have to deal with waiting periods and state-level government bureaucracy.
- You don’t have to stand in line at the gun counter for an hour while your background check clears.
- You don’t have to pay FFL fees, special state taxes, nor any transfer fees for an online gun purchase.
- You don’t have to choose between “this roll mark” and “that manufacturer” and pay higher prices all the same.
State Laws May Vary
Contrary to federal law, some states have either restricted or banned the sale, transfer, and ownership of 80% lowers, firearm blanks, and other gun parts. Because of these restrictions, we cannot ship our products to certain states. Please confirm whether your state is restricted on our Shipping & Return Policy before placing an order. We cannot fulfill orders to restricted states if placed.
What is a Billet 80% Lower?
A billet 80% lower is a firearm blank, a non-functioning receiver that is not considered a firearm under federal law nor by the ATF. Because it isn't considered a firearm, it can be bought, shipped, and owned without a NICS check or having to go through an FFL. These billet receiver blanks are manufactured almost like any AR-15 lower receiver: They're CNC-cut from a block of 6061-T6 billet aluminum. Except an 80% lower isn't drilled or cut to accept a parts kit or trigger. You, the end-user, will accomplish that using an 80% jig, the at-home equivalent to that commercial CNC machine.
Benefits of Machining a Billet Lower
Aluminum AR15 receivers are made from billet or forged aluminum. Forged aluminum is heavier and denser, and may be slightly harder to cut and drill with personal equipment. Billet is a strong alloy, but its properties may make machining at home easier for first-time builders. This guide compares 6061-T6 billet and 7075-T6 forged aluminum in greater detail.
If you plan on machining multiple 80% lowers, billet is a better choice because it will increase the lifespan of your drill bits and end mill bits, which come with your chosen 80% machining jig.
Billet 80 Lower Features & Specs:
- No FFL required to buy, own, or build
- Features 100% mil-spec fit and finish
- Constructed of 6061-T6 billet aluminum
- Type III Hardcoat Anodized finish (available raw)
- Pre-engraved with "FIRE", "SAFE" markings
- Proudly made in the USA
- Limited Lifetime Warranty
Completing Your AR Build
Once machined, your billet lower receiver is ready for accept a lower parts kit. Here's an install guide with detailed pictures. You can also install a buffer tube and buttstock (or pistol brace if configuring an AR pistol). Need assisting with completing your build, or unsure what parts are best for building your rifle or pistol? Check out our full AR-15 parts guide.
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.