Everyone Says GUNSLINGER Is TRASH, But He Got UNLIMITED BULLETS, x999 RANGE And +999 ATK

What the story is about

An F-rank gunner named Lin is treated as powerless until a dungeon trial and a string of extraordinary abilities reveal his true strength. As he uncovers the secrets surrounding his parents and faces increasingly dangerous enemies, his guns, system skills, and unusual powers let him challenge foes far above his rank.