The ruling closes a loophole that made guns developed using 3D printers or assembled with homemade partners essentially untraceable.

The Supreme Court's 7-2 ruling found that "ghost guns" qualify as firearms, and it upholds a federal 2022 regulation strongly supported by police and prosecutors.

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.