After the battlefield practice of the War of Resistance Against Japanese Aggression, it has been shown that at the common distance of 200 meters to 600 meters, the lethality of this gun is stronger than that of the Japanese 38 rifle, but due to the short barrel, the range and accuracy are not as good as the 38 type, and the scale range is 2000 meters, and the accurate range is only 200 meters.

"Congratulations, you got it right!"

Cao Jiawen looked at Lin Xiao's eyes with a dark belly, and said proudly, "This is the extra surprise I said." ”

Lin Xiao hurriedly took the gun, and after a little look, he found an abnormality, this is not a real medium formality, but a small-caliber rifle modified on the basis of the medium formal.

"Changed the caliber?" Lin Xiao stared at him, turned his head and asked.

"You should know why." Cao Jiawen smiled and nodded.

Of course, Lin Xiao knew that at present, the most abundant ones on hand, as well as those ready to be reloaded, were only 5.56mm bullets, and other large-caliber bullets were too small in stock and even fewer shells were recovered.

But......

"Are the bullets already reloadable? How is a primer solved? ”

Lin Xiao's face was stunned again, no, he was dumbfounded, there were too many surprises today.

Historically, since the advent of metal fixed bullets, compared with paper shell bullets, it is a big technological leap, not only to solve the problem of residue left in the chamber after firing, but more importantly, this is a rear loading bullet, which directly eliminates the action of "loading gunpowder and poking", and the firing speed has increased many times.

However, it is very difficult for such bullets, let alone mass production, even if they are just reloaded.

First of all, the production process of the warhead is very complicated, because the lead is very soft and easy to deform, and the pointed lead bullet is not easy to be stored for a long time, so it is necessary to produce a lead core with a copper warhead, or a steel core with a copper warhead to increase the strength.

Of course, this is just for Lin Xiao and them now, in the arsenal of later generations, this process is still so easy.

Even if Cao Jiawen and his machine tools can make this kind of production equipment, then two more fatal problems will follow one after another - propellant and primer.

First of all, the propellant, of course, such a tall bullet can no longer use black powder, otherwise the three shots will be fired, and the eyes will be filled with smoke and the target will not be able to see clearly, and sometimes it can even smoke the shooter to tears, then, no matter how fast the gun fires, it will be useless.

Therefore, the propellant had to use smokeless gunpowder, which was found in the container at the beginning, and its main ingredient was nitroglycerin, and Zhou Xiaojie ensured early on that his chemical plant could produce nitric acid and sulfuric acid, so in the long run, this problem would be solved.

However, the trickier one is still to come, and that is the primer.

This small primer, also called a fire cap, is actually just a small copper round cap installed at the butt of the cartridge case, and this small round hat is not difficult to make, but the difficult thing is that this small hat contains gunpowder - thundermercury.

The production of thundermercury must be made with mercury and nitric acid as raw materials, and a small amount of alcohol, hydrochloric acid and copper must be added to the reaction.

Thundermercury, when it was first invented, was one of the most sensitive gunpowders, and it exploded with a slight bump, or a rubbing.

This thing must not be used as a bullet to launch gunpowder, not to mention that the gunpowder has to be pounded to tamp him, even if it is contained in a medicine pot and hung on the waist, walking and accidentally falling, it can bang you for a while, the light one will be sterile for life, and the heavy one will be life-threatening.

Fortunately, later, people found that Lei Mercury was particularly afraid of moisture, as long as a little water was absorbed, the temper became better, and if it absorbed too much water, it would not even explode.

Therefore, the modern bottom fire gunpowder is made of thundermercury and a little water to make a gel and applied to the fire cap, and then pressed with a three-clawed fire platform stamped from a thin copper sheet and concave inward.

When firing, the firing pin hits the fire cap, the fire cap is deformed and pressed to the fire platform, and the two-phase collision will cause a thunder mercury explosion to produce a high-temperature flame, and the flame will rush into the shell, which can trigger the explosion of projectile.

"Try?"

Cao Jiawen said proudly, and as he spoke, he took out a bullet from his pocket and handed it to Lin Xiao as if he were juggling.

Lin Xiao took a look, this bullet is not like the original bullet, there is a slight pinch mark at the junction of the warhead and the cartridge case, and if you look closely, the butt of the cartridge case has not been equipped with a primer, it is a small round pit.

Cao Jiawen smiled and spread out his palm, and in the palm of his hand was a small fire cap, Lin Xiao hurriedly took it and asked:

"Thundermercury...... Solved? ”

"It's just a trial product, only a little bit has been made, Lao Zhou said, the traits are not very stable, and the formula has to be adjusted......

"So, in the short term...... Can only use stock bullets? ”

"I believe Lao Zhou, you just need to make a statement, is this gun made, or not? …… You don't have to worry about the rest. Cao Jiawen is full of confidence.

"Okay, then I'd better try the gun first."

After speaking, Lin Xiao gently pressed the fire cap into the round pit, loaded it, loaded it, and shouted loudly: "Situ Zheng, target, 200 meters!" ”

"Yes!" Situ Zheng comprehended in his heart, responded loudly, and ran away with the target.

"Smack!"

After a crisp gunshot, Lin Xiao put down the gun in his hand and sighed lightly, this gun, the recoil is very small, and, his intuition tells him that the accuracy is good, he can't help but turn his head and look at Cao Jiawen with admiration, a national treasure-level military master, and it really deserves its name!

The target came, and sure enough, at a distance of 200, one shot hit the bull's-eye.

"Lao Cao, I know that you feel sorry for steel, say, how much can you make for me?" Lin Xiao said flatteringly.

"This gun takes a lot of effort, and there are 3,000 for the time being, right? Anyway, you also feel sorry for the bullets, and when the reloading bullets are completed, I will add them to you? ”

"Five thousand? We're going to expand the army by five regiments soon, and each regiment will give a thousand, right? ”

Lin Xiao stretched out a slap and gestured, smiling with a cheap face.

"Okay, but you'll have to be patient...... It can only produce about 1,000 pieces a month, and it is too difficult to train skilled workers. ”

Cao Jiawen rolled his eyelids and said, probably feeling sorry for his baby steel again.

"Okay, then...... Shouldn't there be fifty more cannons? When will you test the gun? ”

Lin Xiao has not forgotten his original promise.

"The cannon, it was completed a few years ago, and I was waiting for you in the warehouse for a long time, however, there are no shells, isn't Lao Zhou's smelter still in trial production?"

Cao Jiawen spread his hands helplessly.

This guy, is the girl stupid? How can you test a gun without shells?

……

Two days later, He Shouxin's wedding was held in Yixing Dart Bureau.

Lin Xiao and Zhang Chenfeng, Duan Zhenghong, Ding Shuai, Li Hanzhi and several other comrades-in-arms all received invitations, Chen Yiming attended the wedding on behalf of the crossing public, Zhou Gong and Cao Gong They didn't like to be lively, so they entrusted Lao Chen to congratulate them, and the seamen of Qisha Fort were not invited at all.

Lin Xiao went by car, Chen Yiming and Lu Hua didn't know how to ride a horse, so they also accompanied him by car, while Zhang Chenfeng, Duan Zhenghong and others accompanied the guards on a high-headed horse, attracting countless envious eyes along the way.

When Lu Hua helped Lin Xiao get out of the car, He Yi and others had already greeted him out of the door, and after a period of greetings, Chen Yiming and Lin Xiao sent congratulatory gifts respectively.

The delicate Chen Yiming searched for a long time in the warehouse loot and found a pair of silver ruyi as a congratulatory gift, implying that the newlyweds are in pairs and auspicious.

And Lin Xiao was simple and rude, and gave a pair of good saddles and a fan of frozen beef, the former means peace and security, and the latter is simple, I hope everyone can eat meat in the future!