ok the way this mod works, jokers with snipers will use them like snipers same with shotguns and assault rifles, i did have a joker with a mingun but the dmg he was dealing with very very, small jokers will only have guns that police units can have they wont use weapons that you can use like the thanatos or microminigun, WARNING when they have snipers be prepared to be sniper paranoid cause their shots are loud as hell.
keep in mind depending on the diffuculty and jokers skill you have depends on the dmg output