12 of 12 Items
12 of 12 Items
Every AR15 upper we sell is professionally assembled, carefully inspected, and ready to fire out of the box with maximum accuracy and reliability.
We source barrels of various lengths to offer the most popular rifle and pistol configurations that shooters are looking for. Build an ultra-compact AR or SBR with one of our pistol-barreled uppers, or stick to maximizing velocity and accuracy downrange with a rifle-barreled option.
We promise absolute performance by only offering the best barrels. Every upper is fixed with a 4150 CroMoV (mil-spec) barrel for maximum life expectancy and heat resistance, or a 416R Crucible stainless steel barrel that offers precision rifling with sub-MOA accuracy.
Some AR builders prefer standard forged, mil-spec units. Others want new features. So we've sourced uppers that offer both options. Pick a forged M4-type receiver, or go with a billet or side-charging receiver that's ergonomic.
We've got you covered! Use our helpful how-to guides to pick an upper with the right specifications, and complete your custom AR build:
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.