would require buyers of so-called ghost guns — homemade or makeshift firearms that lack serial numbers — to undergo background checks
You can’t make this up. The stupidity is next level with these people
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If you make a ‘ghost’ gun, you can’t sell it - Federal law.
Since it’s a ‘ghost gun’, nobody knows who made it. If the person in possession claims he made it, that’s what they’ve got to go with.