Homemade firearm kits used to build “ghost guns” are now part of the same legal category as traditional firearms after a federal judge declined a gun advocacy group’s request to pause the new regulations brought by President Joe Biden‘s Justice Department.

The decision means the main components used to manufacture ghost guns will be assigned serial numbers and purchasers will be required to undergo background checks before they obtain components. Additionally, dealers of these components must be federally licensed to sell the kits, are required to keep sale records, and cannot sell unfinished gun frames and receivers alongside the tools used to complete them.