The Biden-era regulations require gun makers to perform background checks on people who purchase the weapons kits.

The US Supreme Court has upheld a major gun control policy enacted by the Biden administration to regulate so-called ghost guns - largely untraceable firearms that can be assembled at home using kits.

The rules require manufacturers to include serial numbers on the kits and to perform background checks on those who purchased them.

Advocacy groups have called ghost guns the fastest-growing gun safety problem in America, with the numbers of such guns recovered from crime scenes rising by more than 1,000% since 2017.