Some time back I bought a non functional Colt Lightning 44-40. It had "western" stamps on it which I learned later were from Western Costume Company, an early prop house in California. The rifle was filthy inside, but after cleaning and fabricating a leaf spring I got it back in shooting order and started checking up on it's history. The internet said that the Colt Lightning use in movies was rare, limiting it to an episode of the Rifleman and Sergio Leone's For a Few Dollars More. Western costume didn't work with the company that made the Rifleman, but Carlos Simi, the prop master for all of the spaghetti westerns worked exclusively with Western Costume. Stills give a glimpse of a Lightning on Colonel Mortimer's gun carrier, but that's all. I have no paperwork to back it up, and it's probabaly just a gun that saw a lot of hard work in the hands of various buckaroos on movie sets, but I can speculate that it's there with Lee van Cleef.