People who haven't seen Madoka Magica might not know this, but both the characters Mami and Homura are magical girls who use guns as weapons. But while Mami's gun are magical, Homura's are literally just normal guns she stole from the government.
i really really love the magical muskets for a really specific reason, which is that blackpowder guns are way older than people think and should 100% be treated with similar mythological weight to swords and spears and stuff at this point, and they should have equal prominence in generic fantasy fiction stuff.
lemme put it this way; european longswords and european cannons are siblings. they emerged at basically the same time in the early 1300s, and when the longsword was at its peak use in the mid-1400s, the musket was beginning to proliferate.
likewise, the 'modern' style of katana only started being made in the century leading up to the introduction of muskets to Japan; in fact, the reason the katana became The Samurai Sword was because it was a small practical blade you could wear while you carried a gun.
if you can picture your setting having a sword you can use with two hands, then you should have hand cannons. if your knights have full plate, then there should be matchlocks. if you have a magical girl with a sabre, then you should have magical girls with flintlocks.
