El pistolero

This is not a good film, and much of the criticism of it is justified, but the comment that the use of the LeMat revolver is ahistorical may be mistaken. This film is set prior to the Civil War, and thus before 1861, but subsequent to California statehood, and thus after 1850. The LeMat was first manufactured and sold in 1856. If this is set between 1856 and 1861 the presence of the LeMat doesn't need to be a problem. The use of a katana, on the other hand, is a problem. Extremely few Japanese, or those familiar with the Japanese, arrived in the U.S. before the 1880s, and those who came then were almost exclusively farmers, rather than samurai: Katanas would be very unlikely to be found in antebellum California.