I have arcane firearms as a replacement for bow/arrow in my game because of how it functions. Obsidian glass carries fire magic, and when carved a certain way produces flame. Finer tooling of that allowed them to make a mechanism that severs part of a cylindrical section of the glass and complete the rune and force it to propel itself. With each cylinder having 10 shots between reload if rifle and 6 for handgun, then you have to spend an bonus action to reload if it's a rifle or a object action if it's a handgun.

That's what I did, seems functional. Some people like to keep a fluid mix of bow/arrow and firearms, I get the appeal, but I didn't feel like it meshed in my setting.