Colt's revolver was the first truly mass produced item made using modern industrial techniques. This Colt Dragoon was made in Colts London factory in 1853 in readiness for the Crimean War. It was assembled from parts made in America, from steel imported from Sheffield! The Colt was the defining weapon of the American West. A gun that changed the world.

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I recently read how this weapon changed the course of American History. Up to that time Native Americans, particularily the Comanche, dominated in warfare in the American West on horseback with bows & arrows until this weapon became available to the Texas Rangers and others.
Empire of the Summer Moon: Quanah Parker and the Rise and Fall of the Comanches, the Most Powerful Indian Tribe in American History by S. C. Gwynne
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