"Yeah." He grimaces. "It's not really a gun, it's more... I'm not that familiar with the tech side of it, but, like. Personas can be summoned in the real world if you're in a bad enough situation, right? So you put a gun-looking thing to your head and pull the trigger. Spooky enough already. And then the Evoker's technology makes you really feel like you're about to die. So then you summon your Persona to save your life.

"Like. It works. But it sucks Shido's diseased, shit-caked ass, if I'm honest. Dunno if I recommend it."

He may say that, but he also clearly goes around casually summoning his Persona with his Evoker.