When is a paperweight a firearm? When the U.S. Supreme Court overrules sensible lower court decisions so the federal government can regulate inert objects as if they were capable of firing bullets.

The shocking broad-daylight shooting of UnitedHealthcare CEO Brian Thompson on Dec. 4 was carried out with a homemade firearm that alleged shooter Luigi Mangione may have created with a 3D printer.

Sara Abel, the public information officer for the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) Dallas Field Division, points out a machine gun conversion device on a pistol during a press ...