This bill creates a private right of action , allowing individuals injured or the families of those killed by a ghost gun to sue in federal court. This action can be brought against the maker of any component of the ghost gun or any person who facilitated its sale , seeking damages for the resulting injury or death. The legislation specifies that an affirmative defense exists if the injury or death was caused by an individual acting in self-defense against a reasonably perceived imminent threat, or by a law enforcement officer responding to a public safety threat. A "ghost gun" is defined as a firearm lacking a unique serial number engraved by a licensed manufacturer or importer, including any combination of parts intended for assembly into such a firearm.