Maybe in the next campaign Gaijin could add customizeable Wood Textures, Steel Finishes, and Foliage through orders for weapon appearance just like with soldier customization.
For example:
Kar98k with dark wood grain and green foliage for Normandy Snipers
PPD-40 with blued steel and Walnut wood grain
Rusted old worn steel finish for Mosin M91 Dragoon.
We already have a Phosphated PPSh-41 with a good looking wood grain… AS A PREMIUM…