finishing an AR 80% lower - YouTube other parts are mailable to anyone, as only the lower receive is a "firearm" under federal law. it's the only part that has to be serial-numbered. AR15 parts kits - YouTube You can use a money order in any name to buy these parts, If you pay the extra money for "next day delivery", you can be standing any place, and sign any name, when the stuff shows up in the brown truck. Reloading components and .22lr ammo come in the mail, too, folks. If you 'think" that there isn't a million AR15's that big bro doesn't know about, you're woefully ignorant.