Universal Job Transfer: My Firearms Can Be Infinitely Modified

[National job change + gunsmith + no heroine + no system] More than five hundred years ago, space cracks appeared and ferocious beasts invaded. Professionals emerged. ... Xu Ze awakens as a gunsmith, known as the most expensive profession. If you want high damage, use money in exchange. Xu Ze said that harming this thing is nothing more than modifying it a few more times. [Modification·Damage (White)]: Damage +10 [Modification·Fire Bullet (Blue)]: Attacks add fire damage, causing additional... What? Not enough? Then stack it up! The damage stacks up to 99, and the elite beast dies with one shot. Fire bombs are superimposed, adding high fire damage. When he leveled up, he discovered that the equipment could be modified! Agility, constitution, strength... All can be superimposed infinitely. Smoke! Pump me hard! Xu Ze: How invincible it is~how lonely~