It could. I don't know if you also have your ARCUS unit, but that doesn't work at all.

[He takes out his unit from his pocket. All the quartz is lined up inside, but it looks strangely inert. Like a compact with a bunch of rocks.]

Which means we can't do any crafts or link attacks of any kind. It seems like anything considered magic from another realm might not work. So I'm really not sure about your gun. You might need a spare weapon and be very sparing with those bullets if you do use your gun.