UPDATED MAY 5, 2022
One of the major hurdles that prevented matchlock guns from being adopted on a large scale in North China was the complain that strong wind could blow away priming powder in the flash pan (an opinion apparently shared by Sir John Smythe from England), making the weapon very unreliable. Nevertheless, whilst the opinion had some merits, the advantages of choosing matchlock gun over primitive handgonne far outweighed any downside. To encourage the adoption of matchlock gun in North China, Ming Dynasty firearm specialist Zhao Shi Zhen (趙士楨) designed two arquebuses that were less susceptible to the elements (and to refute and shut up the detractors).
Xuan Yuan Chong (軒轅銃, lit. 'Xuanyuan arquebus')
Named after the legendary forefather of all Chinese people, Xuan Yuan Chong was Zhao Shi Zhen's first matchlock gun not derived from any foreign designs. Drawing from his experience researching and reverse engineering European and Turkish matchlocks, Zhao Shi Zhen created a new weapon suitable for use in both the dry, windy North China, and the humid, rainy South China.