MARTINSBURG, W.Va. – In the basement research lab of the agency that regulates America's firearms, two dozen 3D printers hummed, stringing thermoplastic filament into computer-designed patterns that ...

A tiny, cheap device known as a "Glock switch" or a "machine gun conversion device" allows criminals to convert a handgun into a machine gun and unleash 30-plus rounds in seconds, federal authorities ...

New York state lawmakers and law enforcement officials are pushing for a bill that aims to curtail the spread of homemade devices that can turn average firearms into machine guns capable of spraying ...

For decades, America's detectives have made breakthroughs in crime using gun traces. A homicide investigator typically uses ballistics and serial numbers of weapons checked via a vast network of gun ...