im trying to reskin the gus to a bo 1 pap camo but idk how to to it is there a tut out there help

If you have the material imported to COD you can then use a model exporting tool to export the model from the game that you want to change. From there, there are two things you can do. If you have maya you can open it and apply the material there, gives you more control. Second thing you can do is create a new xmodel entry in asset manager and in the skin override box first specify the material you want to replace that already exists on the weapon, a space, and then the material you are replacing it with(in this case is your pap camo). Convert the model and include it in your mod. Change the model entry in your weapon file to the new model and your done.

There's a tutorial on ZombieModding, couldn't find it on UGX. Here.