After the double-layer gun barrel is built, the welding gaps between the inner and outer layers are interlaced and not on the same side, which can enhance the strength of the gun barrel, without leaking air, and without exploding the chamber.

The built-in gun barrel is then placed on a manual boring machine to polish the inner wall. After the grinding is completed, a well-made gun barrel is completed.

It took half a month for each craftsman to build a gun barrel. A total of thirteen craftsmen and a total of thirteen gun barrels were built in half a month. The weight of each of these new bird gun barrels was nine kilograms, which was heavier than the bird gun and Lumi gun, but much lighter than the heavy fire gun. It is expected that after adding the bolt and the butt stock, the total weight of the new bird gun is about eleven kilograms.

The loading volume of the bird gun with thickened gun barrels can be increased to five to seven cents, which is much more powerful than the original three cents of the Mingjun bird gun. The power is even more doubled. The caliber of the projectile is increased, and the weight of the projectile reaches five cents, which is two cents heavier than the three cents of the Mingjun bird gun. The heavier projectile plus the smoother inner wall can give the projectile a more stable ballistic, and the range and accuracy are much higher.

"Good job!" Li Guodong patted the craftsman's head Zhang Shiwen on the shoulder, "I plan to add salary to the craftsmen. You, Zhang Shiwen, can get four taels of silver every month, and each of the other craftsmen will have two taels of silver per month. If you can also improve the firearm, as long as it is a practical fireball, you can also receive additional bonuses."

After the gun barrel was built, the craftsmen installed wooden brackets, triggers, springs, clip hooks and other accessories on the gun barrel.

The new bird gun installed with all accessories is about the same weight as Li Guodong estimated, with a weight of eleven and a half pounds. For bird gun soldiers, the weight has increased by five pounds, but the power has increased significantly.

Li Guodong took the first bird gun that had just been built and went to the shooting range for a test shot.

Because I was worried about the explosion, the first person to test the gun was Zhang Shiwen, the craftsman who built this gun.

"The range of this gun is unknown. After all, it is the first time to build this weapon and the first time to test the gun. Let's test the gun at a distance of fifty steps first." Zhang Shiwen said.

The fixed-packed paper cartridges that match the new bird guns were also made, and the first batch was to make ten cartridges first.

Li Guodong first tried the weight of the bird gun. Although it felt heavier in his hand than the original bird gun and Lumi gun of the Ming army, because the butt and grip parts were balanced and designed reasonably, the bird gun would not feel too shaking when holding it in his hand. This increase in weight. As long as you train a bird gunner, hanging a brick in front of the bird gun and carrying out gun-holding and aiming training, this problem can be solved in a few months.

Zhang Shiwen took the bird gun, took out a fixed-load paper cartridge, completed the loading like a normal bird gun, and then hung a fuse.

He held his breath, aimed at the target fifty steps away, gently pulled the trigger, pressed the fuse into the medicine pool, and lit the induced medicine. He only heard a "boom" sound, and the scarlet flames spewed out of the medicine pool, and the white smoke rose from the medicine pool, and the fuse was also bounced away by the impact force. Almost at the same time, a scarlet flame tongue spewed out of the muzzle, and the white smoke rose from the muzzle.

The projectile accurately hit the center of the wooden target fifty steps away, penetrated the target half an inch thick.

"Take ten steps back and try again." Li Guodong said.

Zhang Shiwen took ten steps back, stood still, took out a fixed-packed paper cartridge, bite the tail, stuffed the cartridge into the muzzle, compacted it with a strip, then put it in the lead-in medicine, hung a fuse rope, and completed the loading in just twenty breaths. Then he picked up the bird gun again, aimed at the wooden target sixty steps away and pulled the trigger.

"Hit the bull's eye!" shouted the soldier who reported the target.

"Sixty steps can still ensure accuracy, so take ten steps back." Li Guodong said.

Zhang Shiwen took another ten steps back, finished loading, aimed at the target at a distance of 70 steps, and pulled the trigger. This time the projectile was barely on the target.

"It's almost done. If you shoot at 80 steps, you may not know where the projectile will fly to. In the future, our bird gunners can shoot volleys outside 70 steps. The distance of 70 steps has exceeded the range of ordinary Jiannu archers, but it is still not as good as the range of elite Jiannu archers, and even less than the range of Baijia Bayala's bow and arrows." Han Dashandao standing aside.

Li Guodong smiled and said, "It is enough to exceed the range of ordinary Jiannu archers. How many elite Jiannu archers can you have? Not to mention white armored soldiers, that is rare. As for those rare objects, we can also cast cannons, or simply create a small number of fuse-rope rifled guns. Anyway, our fuse-rope rifled guns cannot be equipped in large quantities, and they are just suppressed by their rare objects, which is enough."

Even ordinary archers in the Later Jin army were much more precious than bird gunners. An ordinary archer had at least five years of skill, and it only took three months to train a bird gunner.

As for the bows and arrows that deal with elite archers and white-armored soldiers, it is possible to create expensive rifled rifles. Of course, the rifled rifles are expensive and difficult to build and cannot be equipped in large quantities. They are as rare as the white-armored soldiers of the Later Jin Dynasty. However, training a sharpshooter is easier than training a white-armored soldier. The rifled rifle and arrows are a bargain.

In addition to preparing a large number of bird guns and a small number of flint rifled guns, Li Guodong also plans to buy a batch of flintlock guns from the Flang ferrymen in Macau. The number does not need to be large. One thousand is enough. The accuracy, range and rate of fire of flintlock guns are higher than that of bird guns, and can be equipped for his own elite troops.

Li Guodong currently no longer intends to cast artillery because there is not much pig iron on hand, and casting cannons requires a lot of pig iron. In addition, the cannon consumes too much gunpowder, so he will not expand artillery troops before he has obtained a saltpeter mine.

On the training ground with ice and snow, teams of recruits stood straight.

Drips of water turned into ice. He Xing, who was in charge of queue training, only wore a sleeveless cotton vest. His thick arms showed people solid pieces of tendon flesh. It is no exaggeration to say that his arms were stretched out, which was thicker than the legs of many refugees. He Xing held a leather whip in his hand and shuttled back and forth on the training ground.

During the Little Ice Age during the Chongzhen period, the climate outside the Great Wall was extremely cold, and the temperature on the training ground was very low, probably about ten degrees below zero. However, all the recruits were only wearing a small piece of cotton armor and stood still on the training ground.

"Winter training is the most comfortable season! If you stand in the sun in summer and train in a queue, it will be ten times more painful than this!" The whip in He Xing's hand whipped, "Don't think that you have passed the assessment and become a recruit, and you think you are qualified! Just like you, a Jiannu can kill you a hundred!"

Many new recruits were trembling all over the body, but they did not dare to say anything, and they only dared to curse in their hearts.

A gust of wind blew, and the two soldiers who were once military families shivered. The thick cotton armor could not resist the severe cold at all. They subconsciously jumped a few times, and the originally neat formation appeared a little chaos.
Chapter completed!