A drill instructor in the National Guard has been convicted in a Wisconsin federal court of illegally transferring a machine gun after a rifle he loaned to a student malfunctioned, setting off three shots before jamming. The verdict of guilty on one count in the case against David Olofson was confirmed yesterday by the clerk's office in the U.S. District Court for the Eastern District of Wisconsin. That means now that anyone whose weapon malfunctions is subject to charges of having or handling a banned gun, according to an expert witness who reports that the particular problem is a well-known...