For China, I have some suggestions for the Support Weapons I and II names:


-The Stokes mortar is fine, but instead of the Type 24 machine gun it should be the Type 30 instead. The Type 24 Maxim was only introduced in 1935, while the Type 30 was a copy of the Browning M1917 that was used from the 1920s to the late 1940s.

-Instead of the MG34 and GrW 36, I'd suggest the ZB vz.26 and Type 29 mortar. The ZB vz.26 was China's main LMG throughout the 2nd Sino-Japanese war and nearly every division had one. The MG34 was locally copied, but it was rarer. The Type 29 was a copy of the Japanese 150mm mortars that were well-liked by the Chinese army and mass-produced.

-Support Weapons IV: Use the Type 31 mortar instead of the M2. The Type 31 was a unique Chinese copy of the M2 mortar and actually produced by the Nationalists during the second Civil War.


For the PRC:
-Support Weapons I: Hotchkiss M1914 and Stokes mortar. There is photographic evidence of Red Army soldiers with a few Hotchkiss machine guns.

-Support Weapons II: Type 24 Maxim and Type 20. PRC captured a lot of Type 24 Maxims and used them into the Korean war. Type 20 is an 81mm mortar copied from the French 27/31 or another Japanese 81mm mortar


-Support Weapons III: ZB vz.26 and Type 27. The Type 27 is a copy of the Japanese 50mm grenade dischargers used frequently by the IJA. Many were captured and copied by the PRC.

-Support Weapons IV: DShK M1938 and Type 29.

Hope this helps!