The Supreme Court upheld the Biden administration’s regulations on “ghost guns” Wednesday, finding that guns assembled using at-home kits are subject to the same rules as traditional firearms, including requirements that they carry a serial number and that purchasers undergo a federal background check before buying them.

The Supreme Court on Wednesday upheld Biden-era federal regulations on “ghost guns,” mail-order kits that allow people to build untraceable weapons at home – handing gun control groups a rare win at the conservative high court.

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