Doomsday: I Started as a Gun

What, Doomsday turned into a pistol? It doesn't matter, we can upgrade. Transform from a gun, to a Gatling, to a tank and an armored fighting vehicle. Even spaceships, starships. Our journey is a sea of ​​stars. The end of the world may not be a technological feast! Establish a base, expand territory, research, manufacture, build new types of armies and weapons including robots, restore earth civilization, fight aliens, fight endless herds of beasts and corpses, and colonize the outside world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.