This question already has an answer here:
The world that I'm building is set in a fantasy world that is reminiscent of the early 20th century. Magic involves the traditional eight schools and anyone can become a magician if they choose to dedicate enough study and practice to it. Also, magitech--which only mages can use--exists alongside mundane technology.
Some ideas for mages using a gun could include enchanting them to fire infinite bullets (which when I think about it, would probably not be legal in my setting), putting spells on bullets to guide themselves to their targets, and imbuing them with elemental damage. But the question that I have is how would mages find guns practical when they could already sling around fireballs and such?