500本金计划表图

简介：Below the Fujian Iron is the Jin Iron. The Jin Iron is barely usable, but the chamber explosion rate is still very high. In order to prevent the chamber from explosion, the craftsmen can only increase the thickness of the tube wall. The final result is that the weight of the muskets and artillery is too high. , clumsy and difficult to use on the battlefield, which greatly limits the use of muskets.