25-year-old man from Minneapolis has been federally charged for being in possession of and manufacturing auto sears, devices that are used to convert a semi-automatic firearm into a machine gun.The U.S. Attorney for Minnesota, Andrew Luger, says that Aaron Malik Cato had four 3D printers at his residence and was in possession of several 3D-printed auto sears.In addition to the homemade devices, authorities say Cato also possessed the parts to make up to 10 more devices. Customs and Border Patrol agents intercepted a package sent from Taiwan to Minneapolis destined for Cato, and law enforcement conducted a controlled delivery of...