Insufficient firepower phobia, I only awaken skills

[Urban + online games + science fiction + high martial arts + unlimited firepower] There are monsters and beasts rampant in this world, everyone must be a brave man to drive out the monsters. Su Zhou came to this world to become a gunsmith, and accidentally triggered a mysterious mission. The number of bullets he fired would make him stronger. Because of the fear of insufficient firepower, Su Zhou's small goal was set to fire one billion rounds of bullets! In order to complete this task, Su Zh...