I suggest that using Weapon Parts ( Like Elite Weapon Parts ) to randomize passive weapon abilities again ( like when you got an elite weapon, I will get 2 passive weapon abilities like +30 range, +30 handle ) this will be more handy than pay skell credits every time to build new guns again and again to get the abilities I want.
I think this kind of feature was in The Crew 2 before if I can remember... It would be good for this game too.

addition : xD
please make the weapon paints from ghost war missions attainable from other way also. It's a bit hard for me ( some other people also ).