Winchester Plant Set To Close New Haven, Conn.'s, historic Winchester factory will close at the end of the month after a search for a buyer has proven unsuccessful, Mayor John DeStefano told the Associated Press last week. "It's going to go dark," DeStefano said. He said, however, negotiations over the factory's future are continuing. Belgium-based Herstal Group, the parent company of U.S. Repeating Arms Co., announced it would close the plant in January.