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If you throw a male engineering major who has just graduated two years ago into a turbulent and war-torn time and space, will he end up on the streets in an instant? Classmate Weiss's time travel was a bit deceptive. He brought his half-finished "Identification Friend or Foe System" to an Earth-like planet with more land than oceans and battleships can fly in the sky. He possessed the heir of a handmade firearms workshop family. Yes, there is no mistake, in this time and space, their workshop is still hand-making craft firearms inlaid with gold and silver! What? Want to be a prodigal son who doesn't care about the world? Sorry, there are poaching and suppression by arms giants inside, and threats of aggression from military empires outside. This kind of life is like sailing against the current. If you don't advance, you will retreat. Fortunately, our classmate Weiss is not only an expert with guns, but also an avid reader of a famous military magazine. He is familiar with various war history strategies, and he seems to be on the path to becoming a hero in this troubled world...