An exceedingly rare event occurred on Wednesday — the Supreme Court upheld a federal gun regulation, with four of the Court’s Republicans in the majority.

Justice Neil Gorsuch’s opinion in Bondi v. VanDerStok is narrow, but it turns aside a challenge to a federal regulation targeting “ghost guns,” disassembled firearm kits that can easily be assembled into a fully functional gun. Under federal law, guns sold in the United States must have a serial number that law enforcement can use to identify the weapon. And someone purchasing such a gun ordinarily must submit to a background check before they can complete the sale.........

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