Looks like he has a pair of S&W Schofield revolvers (circa 1871). The S& W American was more popular in the 1870s. Hardly anyone prior to the mid 1880s carried a Colt .45 (the most commom revolver in the movies), they were $15 to $20 new at the time, a months wages for most cowpokes. It was far more common to carry a Remington or Colt cap ‘n ball revolver converted to cartridge, cost about $5.00 to have a gunsmith at that time do the conversion.
How about all the model ‘94 Winchesters in Westerns that take place in the 1870s? The Henry rifle was the rifle that was used at the time. The most popular gun in the Old West? The double barrel shotgun.
The Colt .45 (Peacemaker) came out in 1873 as the Cold Army Model with 7-1/2” barrel. It was accepted by the military as the officer/cavalry side-arm. The 7th Cavalry carried them at the Little Big Horn. It also came in .44-40.
Their long arm was the 1873 ‘Trapdoor’ Springfield in .45-70. It came in both rifle (infantry) and carbine (cavalry) models.
Both Remington and Smith & Wesson had competing models. The various S&W model 3 came in various configurations including the Russian, the Schofield and the American. And Remington had its 1875 model.
I have a Winchester 1886 in .40-82 hanging on my office wall behind me. It shipped from the factory in 1895. That’s a heavier frame model with heavier octagon barrel. The 1886 was marketed for big game.