Doomsday: I Can Refit Divine-level Equipment

Harry traveled to the apocalypse world and was besieged by zombies! When he was on the verge of death, the divine-level refit system descended!
Refit the car and run over the zombies!
Refit pistol to the submachine gun! Da! Zombie guys, let me send you to heaven!
The sniper rifle was changed into a cannonball! Zombies perished!
The refitted tank soared into the sky! Refitted missiles! A precise blow!
The weapons were continuously upgraded, and the power was getting stronger and stronger!
If you were poor, you could use tactics; if you were rich, you could blow up!
Were you jealous? Envy?
Join Harry's team and make sure that there are enough bullets and food!