Honestly, I was going to put that, but I just saw that the problem is that it only works if you don't have any other weapon mod be it skins, models, reanimated, etc. Therefore it will not be visible in first person and will be very confusing. I have several mods to revive the weapons and it does not affect the TLS skins. Therefore it was not necessary to include them.

For that there are other mods from the Workshop that give an RNG or even recently some Sourcemod plugins to obtain the new skins.
Weapons Skins RNG[forums.alliedmods.net]
Weapons Skins Menu[forums.alliedmods.net]

Anyway, I honestly don't really care about skins. But unfortunately I would not put in the Admin Menu, since surely several will have other weapon mods and they will not notice it.

But you can get with putting !give rifle_ak47 1 to have a skin.