Not had those probs with my 390 (or 7970) on any I've played.
Your the only post I have seen here on it.
Verify game cache ?
What does Beth. forums/support say ?
Do you play the game on Ultra and Vulkan-Api? Maybe it's some setting which is causing it. I played tons of hours in MP and SP it only happens on Snapmap. Some Weapons like the Heavy Assault-Rifle are missing Textures so im sure its either game or driver related.
Made a Screenshot (look at the Gun Model)
Snapmap Map is called Caviar.