One Piece: GunMaster

Ian Kagami, who Transmigrated to the world of One Piece during his time reading the One Piece manga "Luffy vs Kizaru" scene where Gorosai appears.
With a cheat skill, Just wants to be alive, make a name for being the best GunMaster in the world, and fight in the war that everyone in the world is waiting for where only the admiral-level powerhouse hopes to have a chance of being alive at the end.