During this period, Ji Xinyu explained to Niu Gu and others why the rifling was pulled, and the difference between a rifled gun and a smoothbore gun was the rifling in the barrel. Smoothbore guns were not rifled and used round ammunition, and the projectile and barrel could not form a seal, which prevented the propulsion from being used to the maximum. Therefore, the shooting distance of the general smoothbore gun is only about 100 meters, and after 150 meters, it will not be able to form a lethal injury.

Because the rifled gun has a wound rifling, the gun bullet rotates rapidly after ejection, which offsets the resistance of the air, coupled with the expansion and airtightness of the mini bullet, makes full use of the expansion thrust of the gunpowder in the chamber, and the current gunpowder range can reach more than 300 meters, and accurate hitting can be guaranteed within 250 meters.

"Young master, you are really too godly, you can think of such a gun, and these two machines are simply masterpieces." Ushiya sighed as he measured the inner diameter of the barrel with a vernier caliper.

"You made it all up, and I'm just a helper." Ji Xinyu said. In fact, I was thinking in my heart that this was all due to Aiden.

"This is all the young master's idea, we are the ones who started, I have long heard that when I was in Bashu, the young master liked to make strange things, I didn't expect it to be so powerful, the young master is really the reincarnation of Lu Ban." Ushitani said, pointing to the drawings on the table.

The warsmith next to him also echoed: "The villain has been making a fire gun for more than ten years, and I have never seen a gun barrel that can be polished so quickly, and now I know that the gun barrel can still be done in this way, and the young master is really the reincarnation of Lu Ban." ”

Hearing the echo on the side, Ji Xinyu's face turned red, the original Ji Xinyu really only invented useless things, smiled awkwardly and said: "As long as you use your imagination more, you can also make useful tools." ”

Hearing this, Niu Gu next to him was stunned for a moment and began to think. Ji Xinyu took out a stack of prepared drawings and gave them to Niu Gu, Niu Gu saw that the young master gave him the drawings again, and he was stunned for a moment when he received it, and then said in surprise: "Young master, this is the rifled gun you are talking about?" ”

"This is a flintlock rifled gun, wait until you make it and name it." Ji Xinyu said.

Ji Xinyu took out the blueprint of the rear-loading rifled gun, imitating the Mauser rifle, and using the classic rotary pull-back bolt structure of the previous life, but the excitation method was a ramming flintlock pistol. Ji Xinyu remembered that in the Ming Dynasty in the history of the previous life, there was a record of a percussive flintlock pistol called "self-generated firebolt", and the subsequent flintlock bolt excitation method was modified according to this structure, and now the bolt of Ji Xinyu's gun has also been improved, and it has been changed to the ignition method of using a fire cap.

The most important thing about this gun is the design of the bolt, it is not difficult to manufacture, before this, Ji Xinyu has asked Aiden to make a set of bolt parts, take out the parts one by one, and hand them over to Niu Gu to measure the size and imitate.

The bolt consists of a pull handle with a push rod, a chamber and an excitation device, and Ushiya disassembles several parts and has several craftsmen work together to start replicating them based on samples and drawings.

Ji Xinyu was teaching a few craftsmen to make bullets for rifles on the side, and Niu Gu also came over to watch after arranging it, and his curiosity was still very strong.

The bullet used in the rifle is a paper shell bullet modified from a simple structure and a highly adaptable Mini bullet, and Ji Xinyu first arranged for someone to nitrate the paper shell, and at the same time ordered someone to make a round linoleum.

Niu Gu asked on the side, "Young Master, what is this linoleum for?" Is the wiping gun too small? ”

"This linoleum is placed at the very back of the paper shell to help seal the barrel, prevent air leakage, and also clean the inner wall of the barrel." Ji Xinyu said with a smile.

"I know about sealing the barrel, but cleaning the inner wall...... Do you want to use the strips drawn on the picture to get through? Ushiya asked curiously.

"After the bullet is excited, the linoleum will stay behind the barrel, and when the next bullet is fired, it will naturally push it out of the muzzle, just enough to lubricate and clean the inner wall." Ji Xinyu took out the barrel of the gun and said while instructing.

"It's ingenious, young master. The Mini bullet on this drawing is also a little strange, the current projectiles are all round, but it is cone-shaped, and there is a cork plug in it that is partially empty in the middle. Ushiya continued to ask with the drawings.

"This is the Mini bullet, because it is a lead bullet, so the whole is relatively soft, and the hollow cork can make it expand rapidly when it is impacted, and fit the inner wall of the barrel, so as to achieve the effect of sealing, and the range will naturally increase." Ji Xinyu continued to explain, and at the same time arranged for someone to bring the mold over, the Mini bullet mold had already been made, and it was customized according to the 150 mm caliber of the barrel.

The lead and tin needed for Mini bullets are still easy to find, and it does not bring much difficulty, many places in Zhongzhou use lead to add copper coins, the more worthless copper coins, the more lead in them, so lead is very cheap in Zhongzhou.

Tin is relatively difficult to find, and tin from Zhongzhou is generally used to purify water at the bottom of wells; or add it to copper to make bronze; In addition, some people in Zhongzhou have begun to use tin to make pewter, which is a relatively expensive decorative vessel. However, Qiongzhou Island is a barbarian land in the eyes of the mainland of Zhongzhou, and tin craftsmen are reluctant to make and sell here, so there is no large amount of tin in the market.

Fortunately, Ji Xinyu and Aiden found a tin mine along with the quartz mine next to a valley not far from the northern sea, but it is more than ten miles away from Lingzhou Mansion, and there are several villages in the middle, and Nanyue Creek, so Ji Xinyu is not ready to take people to mine for the time being, but he has been there twice and brought back a pile of refined tin and quartz sand.

With these, there is basically no difficulty in making Mini bullets, melting the two metals, fusing them and pouring them into the mold to form, and when they are cooled, the mold is the rough embryo of the Mini bullet, of course, these rough embryos still need to be polished before they can be used.

Saltpeter and sulfur are also not valuable things in Qiongzhou, but the quantities are not so large. With this, the manufacture of gunpowder and the nitration of paper were no longer difficult for military craftsmen. Aiden made some improvements to the formula of gunpowder, Ji Xinyu found a few workers to teach it, and then asked a military craftsman to lead him to a separately arranged workshop to make gunpowder and nitrated paper, afraid of accidents.

Ji Xinyu found Lin Yuan, a carpenter from the palace, and asked him to find ten carpenters with the best skills to build a wooden gun body according to the drawings. Ushiya and the remaining six blacksmiths began to confirm the process of building the gun, first creating a mold, then grinding and splicing it according to the drawings to form the bolt, then welding it with the barrel, and finally installing it into the wooden gun body.

The accuracy requirements of this design are relatively high, but the craftsmanship of Niu Gu and the six military craftsmen, plus the accuracy of various boring knives on the boring machine can be fully competent, and after confirming the process, Ji Xinyu asked Niu Gu to start making them.

To Ji Xinyu's surprise, more than ten days later, Niu Gu referred to the boring machine that Ji Xinyu taught him to make, and together with several other blacksmiths, he studied a milling machine and grinding machine suitable for various processes of blacksmiths and carpenters. Ji Xinyu felt that he still underestimated the creativity of people in this era, and gave them a general idea, they can also create infinite possibilities like researchers in previous lives.

Seeing Ji Xinyu's arrival, Niu Gu rubbed his hands and said excitedly: "Young master, how about you see the new machine we built ourselves?" ”

Looking at Niu Gu, who seemed to be waiting for praise, Ji Xinyu tried the machine tool they made and said with a smile: "Very good, it is necessary to be brave in innovation to improve efficiency, Niu Gu, you will be the leader of the steel experimental group in the future, and the monthly salary has risen to eight taels, and the other 8 people have also passed the test and become members of the steel research group, with a monthly salary of 5 taels." In the future, they don't have to go to other places to find work, they can work in Lingchuan Mansion with peace of mind, and their families can also come over, and I will divide their fields for them to work. ”

"Thank you, young master, for the compliment, we will definitely make persistent efforts." Niu Gu said with a smile.

"Thank you, young master......" Several other blacksmiths also chimed in excitedly.

"How's the flintlock pistol made?" Ji Xinyu then asked.

"Back to the young master, because there are more preparations in the early stage, only two have been completed now, and the others are still being made, and now that there are new machines, it will be faster to do later, and we haven't tested these two guns yet, so we're waiting for you to try them." Ushitani had a box taken out from behind the boring machine, containing two finished flintlock pistols, placed in the middle of a wooden stand.