Moscow.:
Russia.: Degtyaryov DS-39
Germany.: MG34
Normandy:
USA: Browning M1919A4
German: MG-42
Berlin.:
Russia.: Goryunov SG-43
Germany.: MG 81
Tunisia.:
United Kingdom: Vickers Mk. AND
Italy: Breda-SAFAT light machine gun
Stalingrad:
Russia.: Maxim M1910/30
Germany.: Parabellum MG 14/17
Pacific.:
USA: Type 92 heavy machine gun
Japan.: M1917A1
I think it would make the game a lot more fun. Knowing that each campaign has different stationary weapons. Each of these weapons is belt-fed. You can contractually limit the belt to 75 (50 is not enough and 100 is too much) rounds and add a full-fledged reload amination that would last about 7-8 seconds. Thus, completely remove the overheating of the weapon. Most importantly, add two cameras to your weapons. The first is general (larger field of view) the second of sighting devices (smaller field of view, slight zoom).