Skins are a new feature added in R2DA which decorate and make showing off your gun easier. Apart from looking aesthetically pleasing, skins provide no benefits for your character or weapons.
To customize your gun, purchase it, then click the crate icon. Afterwards, click "Unpackage" icon to get your skin.
You must own a Skincrate to unbox a custom skin that can be applied to your gun.
Only weapons with more than one skin are listed here.
For a list of removed skins click here.