Part of the gun that the police believe was used to kill the C.E.O. of UnitedHealthcare was made by a 3D printer using a popular design found online. By Thomas Gibbons-Neff and Aric Toler At first ...

Once police released details on the arrest of the suspected shooter of UnitedHealthcare CEO Brian Thompson, internet sleuths identified the weapon used as a Chairmanwon V1, a version of a popular ...

This story was originally published by The Trace, a nonprofit newsroom covering gun violence. Subscribe to its newsletters. For decades, weapons manufacturing has been the domain of arms industry ...

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 ...

3D printing is a downright futuristic technology. People can use plastic filaments, resin, and other materials to create custom objects. The quality of the print is limited by a user's printer, but ...