Yeah, that was my fault. They can use G43s.
Ahem. I should point out that this is simply not true. The only weapon Volksgrenadiers can use are the slot weapons, Kar98k, and Panzerfaust.
There are files that dictate what weapon a unit can use, which currently cannot be edited in the current mod tools. Weapon classification does not mean anything. MP44 and BAR use the same animations, surely you haven't found the latter to be unusuable by Volksgrenadiers?