After drawing drawings for several days in a row, the more Su Xuan thought about it, the more problems he found.

The blueprint of the fire gun drawn by Su Xuan is a fire door gun.

This firearm has a small hole in the back end of the barrel, which is the fire door.

So there had to be a hand to ignite the gunpowder in the chamber.

In this way, the accuracy of the firearm will be greatly reduced.

......

Chapter 779 Don't think you're young You're hitting your hand, please wait a moment,

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