"Li Chen's understanding of firearms was not extensive, but he knew that the rifling was a meticulously crafted process.Otherwise, the gun prototypes that existed in Ming and early Qing dynasties woul...responded with a nonchalant sound, waving his hand to signal that they could sit down. He kept his eyes fixed on the book in his hand, ignoring them completely.Zhou Ping'an and Zhou Changshou were bot...