Thanks steel, that's helpful. However this doesn't really work in game, as you pointed out. When I added StG-44 for Volks the weapon doesn't have model and sound, and when I gave them Grenadier's MG42 upgrade the MG model is screwed - the bipod floats in the air and magazine is attached to the barrel. What's interesting, when my Volks squad got killed and enemy Penals picked up the MG, the model was still like this.
The MG42 model is always messed up. If you upgrade it in the game it's still messed up. Don't know why Relic hasn't fixed it yet.
The StG-44 for Volks is the issue I'm having as well. Like Spartan_Marine88 said, there's something that needs to be adjusted to allow the particular model to use that weapon. Right now, the volksgrenadier don't have the 'permission' to use the gun.
It can be funny to see an invisible gun killing the enemy though. 
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