Managunner might be a stupid name but I really couldn't think of anything better at the moment.
Anyhow. These are the basic unit for humans: trained at the academy, these are the apprentices that where found lacking in magical capabilities. They are thus given a magic rifle to make do, these are basicly modified wands that can cast a specific projectile spell by the pull of a trigger, only requiring the user to give up some mana. In later tiers the rifle becomes capable of firing a significantly stronger shot at the expense of the user's mana bar, making these great units for quick hit and run micro.