The 14-year-old boy who allegedly shot and killed Newark, N.J., Detective Joseph Azcona in a barrage of 29 bullets used a ghost gun with a device that turned it into “the world’s smallest machine gun, ...

Discover just how the machine gun has evolved over the years, from crude black powder cannons to the digital revolution.

In New Mexico, police and prosecutors backed an effort to outlaw devices that convert pistols into machine guns. In Alabama, the governor made it a priority. Lawmakers in both states - one led by ...