Flintlock pistols, as well as various firearms, the most important part is the barrels.

In order to ensure that the chamber does not explode when firing, it needs to be carefully crafted.

Especially in the welding of the pipe, the thickness should be uniform.

Manually drilling the pipes is time-consuming, labor-intensive, and the production is slow, and it takes a craftsman several days to create a pipe.

So at the suggestion of Zhu Yunxi, the Ordnance Bureau adopted a hydraulic drilling machine.

Under the action of the current, a simple machine made of bronze, belt

"Da Ming: My Grandfather is Zhu Yuanzhang" Chapter 223 The Age of Ingenuity is in the middle of the hand, please wait a moment,

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