AR-15 "Ghost Guns": an Increasing problem

A man in a town near Akron, Ohio, was arrested recently by federal agents, who found 55 untraceable AR-15s in his home. He was selling the guns, which have no serial numbers, illegally, according to a federal indictment. As discussed in American Gun: The True Story of the AR-15, such ghost guns are an increasing problem for law enforcement as they try to solve crimes and control gun violence. "Ghost" AR-15s are particularly easy to make.