I really only want to do 2 things right now, I want to add a weapon mod to a gun however I cant seem to figure out where to change what mod a gun can use and I also want to change the loadout of the legion troops but I don't know where the inventory packages are located. Can someone help???

i think that's put down in some formlist. should be named something like the gun it belongs to

for the mods you cant just add a silencer to an assault carbine say because you need a model of the weapon with a silencer on it for it be on the gun in game, if you do have the models already created it is as simple as using the mod options tab on the weapon in question and just selecting the item that will be the mod in game and putting in in a mod options slot then selecting the modified weapon model for it