Throw a man who has just graduated from engineering for two years into a turbulent and war-torn time and space, will he be thrown into the street in an instant? Weiss’ time travel is a bit cheating. He came to a place with a land area larger than the ocean , an earth-like planet with warships that can fly in the sky, possessed by the heir of a handmade gun workshop family. Yes, there is no mistake, in this time and space, their workshop is still handcrafting craft guns inlaid with gold and silver! What? Want to be a prodigal son who doesn't want to compete with the world? Sorry, there are munitions giants poaching and suppressing them, and military empires threatening outside. This kind of life is like sailing against the current, if you don't advance, you will retreat. A master of the gun, he is also an ashes-level reader of a famous military magazine. He is familiar with all kinds of military history and strategies, and he mixes it up. It seems that he wants to become a hero in this troubled world...