I don't believe you can unless you port the dw versions into the game. I don't think they have the base dw stats for the pistols in zombies but I could be wrong
You can set the upgrade limit to 1 I believe
For BO3 all mods are on the Steam Workshop
Is the Xmodel set up properly in the weapon file?
It's nothing to do with coding. What's happening is the game is seeing 2 identical assets in APE, so what you should do is go into APE and find that material, and delete one of the 2.
ww as in Cod WW2 or WaW, yes