This third episode of the series The Story of the Gun: The Complete History of Firearms concentrates on the changes in gun design during the 19th century. Of special note is the perfection of the revolver under the auspice of inventor and businessman Samuel Colt. Also considered is the role the gun played in the expansion of the United States into the West and the continued implications of that expansion on the American psyche. Actor Cliff Robertson narrates this tale of cowboys, Indians, and lawmen.