In the Russian army during World War I, only the Caucasian Cossacks and some "national" units, where the papakha was part of the national combat uniform (for example, the "Wild Division" of Caucasian highlanders and Turkmens), wore the papakha year-round. In the summer, the Russian army used peaked caps.
These figurines depict unregulated papakha hats worn with summer uniforms. Such papakha hats could have been used in militia units due to a shortage of hats in warehouses (although I don't recall anything like this—though, for example, outdated uniforms were indeed issued to troops). It can be assumed that these figurines depict militia infantrymen in the spring or summer, when it's already hot to wear their greatcoats during the day and the soldiers simply left their greatcoats behind.
Although, for militiamen, they are very well armed (fully armed with modern weapons and equipment, according to regulations). During the Civil War, uniforms could have been anything, but then again, weapons and equipment were even more difficult...
I wouldn't add such figures to my collection, as they're not typical...