As far as the types of weapons go, they're absolutely historical (if a hair early, the "Chiang Kai-Shek" was adopted in 1935), check a copy of Small Arms of the World or other reference document on small arms. The Mauser 98 was very well traveled, being a common infantry rifle almost everywhere that wasn't part of another European nation. Certainly there were other rifles chambered for 7.92mm x 57 IS used (Belgian FN M1924 and M1930, Czech Brno M1924, all of which are copies of the 98 Mauser), and Chinese copies of these rifles.