Some guns don't have certain colours, so I advise you to play the vanilla skins or use a skin, that has a similar colour theme Enjoy and leave suggestions and a rating. The number is the Finish Catalog which is the second number above the float value. This is a list of some CS:GO Loadouts based on colours.
These numbers can also be found when inspecting items in your inventory.
Some skins are specific to a weapon like the P250 x-ray is not the same as the M4A4 x-ray, the specific gun is listed to the right in parenthesis if it applies to the skin. Numbers are in front, might want to use Ctrl+f to find the skin.
