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8 days agoIn the United States, only the lower is considered a gun. There’s no check needed to buy the barrel or slide components, meaning you can print the lower, preferably from a fiber reinforced material, and just slap the unregulated upper components into it.
Nope, not kidding. the receiver is the component that is registered as a firearm, and the rest of the parts that go in it are unregulated. That’s also why you may have heard of “80%” receivers. They’re not machined all of the way so they are not considered firearms and the purchaser can then finish the machining and install the parts.