I like how obvious it is that he just strapped the blade of his magic sword to his gun himself. Like, it's not even a magic gun or anything, it's a sword. But he hates swords, so he strapped it to his gun, because he loves guns.
Also, I wonder if the gun he has his sword strapped used to be a person. And if so, is it somehow that was important to him somehow or something? And just on the topic of the transformations, does his gun sword do "special transformations" in the same way our MC's does? What would that even be like for a sword that turns people into guns...?