@hoomandaw the gun feels out of place because there is no hint of the world being within the industrial age, especially since the invention of the gun drastically change warfare, so why have we not seen more of it? As well as the fact that a revolver is called a "minor weapon" meaning that it is common and able to be mass produced and sold, so why don't more people have one as a precaution, and why have we not seen anyone holding an alternative firearms such as forms of rifles or references to families that have trained in guns similar to swords such as a 'gun king'.
I would agree with Kisato that a flintlock would be better as since its a world of magic, she could've used her magic to act as a substitute for gunpowder essentially making it as effective as she can drop a round into the gun itself to reload, it could've been a form of magical weapons or training, it doesn't become a random piece of technology that doesn't match with the world that we've seen, it would've just been a metallic barrel attached to a wooden stock and ball bearings with the only learning curve would be her learning aiming, range, and the habit of a controlled explosion. It could've been more interesting than just 'here is a gun so you don't start a forest fire'. It's lazy world building.