Here is the thread where I already did this. Download it there.
Originally Posted by iGhost
This is part of gsc modding
Just do this
self giveWeapon( "spas12_mp", 8, false);
8 is the camoID, differnet numbers gives different camos.
If you don't know how to do GSC modding, then either learn it, or don't worry about doing that.
GSC != textures
Its not really possible to be running a mod and go out and play public games and eve if it is, its more trouble than its worth to go through all the work to get a camo, when you can just edit the skin itself to have it.