The US Supreme Court on March 26 upheld the federal regulation of built-at-home “ghost gun” kits, backing a rule put in place during the Biden administration to stem what officials said was a torrent of untraceable weapons.

The Supreme Court ruling affects ghost guns, the largely untraceable firearms used in a growing number of crimes over the past decade.

In a rare ruling that reins in gun rights, the Supreme Court has figured out that a gun is a gun, whether you buy it ready-made or build it from a kit.