Blondie carries a Colt cartridge revolver which is actually non-historical as it is not actually a "conversion" of a cap and ball revolver but more in the way of a factory cartridge revolver--a conversion revolver has a "filler ring" which mounts the loading gate and a turned-off cylinder however these guns have full length cylinders and loading gates which are factory engineered into the frames. In fact, these revolvers are essentially Model 1872 factory cartridge revolvers except for the fact that a Model 1872 would not be able to mount the Model 1851 barrel. Uberti, then, has created the world's first Model 1851 factory cartridge revolvers by specially machining some raw forgings to become .38 centerfires. Tuco also carries a Cartridge Navy, his being fitted with a lanyard loop, which instead of a holster, is stuck in his pocket (because Eli Wallach had trouble holstering a revolver without looking at the holster.) Angel Eyes also used a Navy Cartridge to murder a sickly old man towards the beginning of the film, firing it through his pillow. He keeps this Navy when serving in the Union, but carries a Remington 1858 for his own use. Throughout the film, it becomes obvious that if they have a cartridge revolver, they are going to fire it in the scene. In any other scene, the revolvers change to unloaded percussion models (with the exception of Blondie's). Cartridge revolvers were being manufactured even this early in the Civil War(see 1861 Prescott Revolver, .38 Rimfire). A rimfire revolver would not actually be an anchronism however Colt never chose to violate the patent while many others did.