The weapons in this film are 15-25 years in the future. The year setting was stipulated as 1849, but most gunmen carry the 1873 Colt Single Action Army (aka; The Peacemaker), while the lead carries two 1875 Remingtons. The long arms include an 1873 Springfield Rifle and an1873 Springfield Carbine. Least offensive is the Remington Model 95, a pocket over and under Derringer, that went onto the market in 1866 (only 17 years premature!).
Although set in 1849, in the saloon there are several coin-operated gambling machines - the first of which did not appear until 1888.
Though the setting for this film is specified as 1849, gunmen wear gun-belts with loops for fixed ammunition, something that would not occur for another 10 years, and would only start to become plentiful in the late 1860s and 1870s..