Mil-spec AR 15 rifle kits available in 5.56 NATO and .223 Remington.
AR 15 rifle kits provide a cost-effective way to build a custom AR-15. Our AR kits are packaged so you get every piece, part and pin required for your build, except for a stripped lower receiver (80% lowers are optional). Investing in an AR 15 rifle kit allows you to avoid FFL dealer mark-ups and premium prices from name brands, while getting your hands on the same, quality components in the exact configuration you want.
Our AR 15 Rifle Kits come with barreled upper assemblies. You don't need to buy gunsmithing tools to install your barrel or handguard -- we've already done that for you.
Completing your kit requires purchasing an 80% lower (available on the product page) and fabricating it, or purchasing a stripped lower receiver from an FFL. You must install the included lower parts kit in your lower receiver to make your rifle kit functional.
Guide: How to Install The AR-15 Lower Parts Kit
All barreled upper receivers are ready to install out of the box. Each kit includes fixed, A2-type front sights or no sights, low-profile gas blocks, threaded muzzle devices, and Keymod, Picatinny, or M-LOK handguards.
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 rifle kit is not difficult. No advanced gunsmithing knowledge is required, and all parts included in your kit are made to fit together with simple pins and bolts. Only basic hand tools are required. First-time builders can assemble a rifle in 1 to 3 hours.
5.56 NATO produces higher chamber pressures than .223 Remington. It also has a longer throat. Because of this, loading 5.56 into a .223 receiver may be unsafe. The .223 Wylde chamber was developed to safely handle both .223 and 5.56 loads in one rifle.
You will need a set of AR-15 roll pin punches, a punch hammer, and a castle nut wrench (also called an Armorer's Wrench) for the buffer tube. Purchase the tools required here.
Some rifle kits feature an upper receiver assembly with an integrated M4/M16-style "FSB" front sight only. Kits with free-float handguards do not include any sights. You can purchase iron sights for your kit here.
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.