sentences:  The state of Connecticut has been trying to place the complex under the administration of the National Park Service as a National Historical Park, similar to designation granted the Lowell National Historical Park, another important site in the history of American industrialism.In 1994, Colt's Manufacturing Company vacated the Hartford complex amid financial difficulties, consolidating operations at a West Hartford, CT location opened in the 1960s.A former tenant in the East Armory, U.S. Fire Arms Manufacturing Company, originally manufactured replicas of historic Colt pistols, before diversifying and discontinuing the replicas.