I kinda want to read this, but idk. The mc using firearms is a huge turn-off for me. If he can just keep using them indefinitely without any real drawback, it feels pointless to get into. Guns are convenient, easy to use, and often bypass the tension or creativity that makes other stories good. If the author tries to gloss over the ammo issue with something like "converting sun energy into bullets", I'm just gonna drop. However if our boy learned magic and learned to create magic bullets-thats a totally different story because atleast he'll have to "try" learning magic. In other manga, there are at least some limits that make gun use feel earned or temporary, which helps make it more bearable.