As per a Reddit post some user share their problem

One thing I've noticed is when we go back to an area with a gun smith, we can equip the weapon skin right away.

When we leave the game and come back, the weapon skins are gone from the list, but our weapons still appear to have the skins applied (my weapon was still white and black after applying the pinnacle skin). Even though we can't see them as a choice in the menu.


Update 1 August 1