Regulating ghost guns - Finland and Sweden consider NATO - Psychedelics' treatment potential

A "ghost gun" is a firearm that comes packaged in parts, can be bought online and assembled without much of a trace. The new rule essentially expands the definition of a "firearm," as established by the Gun Control Act, to cover "buy build shoot" kits that people can buy online or from a firearm dealer and assemble themselves. It will make these kits subject to the same federal laws that currently apply to other firearms.
...
Commercial manufacturers of those kits will now have to be licensed and include serial numbers on the kits' frame or receivers. In addition, commercial sellers will have to be federally licensed and run background checks before selling a kit.
...
The rule also tackles ghost guns already made and in circulation. The DOJ will require federally licensed dealers that take in any un-serialized firearms to serialize them before selling the weapon. If a licensed dealer acquires a ghost gun, the rule will require them to serialize it before re-selling it.