“UBCs” are a meme, and are fucking useless in the age of 80% receivers and 3D-printing. If UBCs were implemented, all people would have to do to make a private sale is sell everything but the receiver. All you’re doing in inconveniencing regular people, making it harder and more expensive for poor people and minorities to own guns, and doing nothing about the misuse of guns.
Opposition to UBCs has nothing to do with rights or safety, and everything to do with first-sale doctrine and free exchange between people. Not only are UBCs a violation of the 2nd amendment, but also the 9th and 10th amendments and the commerce clause.
And yet UBC half-measures are still a full-measure more than what we’re doing now.