make it posible to make self made gunwraps and skins. There are like special skins and wraps that ar special looking and youare able to get them by buying(no real money only ingame currenzy that you get throu playing*) and finding tresurechests that work like packs in apexlegends or overwatch. you get 3 items per pack. and in one of the 3 slots could be one of those things:
*thisway it is NOT pay to win
If we do get gun cosmetics I think it should just be where you can change the metal to something like shiny or rusted copper or shiny iron or gold. Different wood colors. And small trinket attachments you could add to your gun. And all of these would only be cosmetic and would provide no in game benefit.