Changing starting weapons for vanilla maps

Game Modding | Call of Duty: Black Ops 3 | General Discussion

UndeadRyBread:

I'm making a weapons mod and I am attempting to change the starting weapons for the vanilla maps (nacht, verruckt, soe, etc). I know that if you want to change it for custom maps you use the .gsc file, but I am unsure how to get the .gsc file for the vanilla maps in order to modify them, or if that is even recommended approach and there is an alternative method.

If someone could throw me a bone on how I could implement this I would be very grateful :)