I just learned of this a few weeks ago and found it pretty interesting. You can buy an AR lower that is 80 percent finished and because it is not functional it is not considered a firearm. It requires no serial number and no registration. It can be shipped to your house and you can finish it yourself with a drill press. If the firearm is built for yourself it is not required to be registered with the ATF. More info in the link below.
http://www.tacticalmachining.com/80-lower-receiver/
http://www.tacticalmachining.com/80-lower-receiver/
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