For sure our impression of the firearms used in the "Old West" was influenced by Hollywood. They used what the prop department brought them, and they used Bannerman to supply them apparently. Most are Winchester rifles and Colt revolvers, primarily because those were still commercially available during the "golden age of westerns" in the 1950s and 1960s. You will probably never see a Whitney-Kennedy or a Bullard or a Sharps-Borchardt in any scene featuring a rifle, you will likely see Winchesters. Just as in westerns you will never see Merwin & Hulbert revolvers, Iver Johnsons, US Cycle Works, Remington 1875s, S&W #2 or #3 revolvers (unless they are replicas), simply because they are hard to come by and no one wants to damage a $4000 rifle, they would rather total out a $400 rifle. I did catch the new Magnificent Seven movie the other day, and I was impressed that they had Winchester 1876 and Spencer rifles, open-top 1872 Colts, Greener shotguns, and several very unusual firearms (for a movie).