Among the countless flowers, Qin Xiaowei is the most dazzling one.

Although Beraune spent less than 8 months in the Baiyun Factory, Qin Xiaowei benefited a lot, not only fully inheriting the unique firearm structure style of the Berkeyne ball locking mechanism, but also actively exploring the best way to automatically match firearms.

And the general-purpose machine gun in front of him is the culmination of his accumulation over the past few years.

"Success?"

Watching Zhu Yingqi shoot from time to time, sometimes with bursts of shooting, he finally opened his mouth and asked the key question.

"Yes!" Qin Xiaowei is as concise as ever.

"Gas conduction or barrel recoil?"

"Semi-free bolt type!" Qin Xiaowei is still plain and concise, but Bai Yi is slightly moved, as far as the automatic principle of firearms is concerned, the air guide type and the barrel recoil type are the two most common automatic methods used by automatic firearms, and of course, they are also the two easiest ways to get started.

Because of this, Bai Yi felt that Qin Xiaowei's general-purpose machine gun might be some kind of transformation of these two automatic methods, because in his opinion, as a newcomer with almost zero experience in gun making, Qin Xiaowei's most reliable breakthrough is to use and improve mature technology.

Just like Tang Jichen's automatic grenade launcher, this is the way to go, and when it is unsuccessful, the key is not to make too many mistakes.

But Qin Xiaowei is obviously contrary to ordinary people, and directly follows the principle of semi-free bolt-action automatic.

This kind of automatic method was not unusual a few decades later, but in the early 50s of the 20th century, it was unprecedented.

Therefore, in the mainstream firearms design world at this time, this kind of automatic method has always been regarded as heresy, especially in the field of automatic and semi-automatic firearms, and the semi-free bolt-based automatic principle is a taboo for designers.

Because in the eyes of mainstream firearms designers, the hypothetical automatic method born from the principle of all-free bolt-based automatics can only be majestic on pistols at best, and at most effective on submachine guns.

As for the more powerful semi-automatic and fully automatic firearms, this automatic method is simply not capable of withstanding the continuous impact of high-powered ammunition.

Because of this, in the eyes of firearms designers in various countries, this kind of automatic principle is no different from the tasteless and discarded chicken ribs, and it is often put on the shelf after a few glances, and has never really been applied to practice.

However, others don't know, but Bai Yi knows that the semi-free bolt-based automatic principle is not a chicken rib, but a promising shining technology tree.

It's just that what Bai Yi didn't expect was that Qin Xiaowei in front of him seemed to be earlier than the Europeans, and he had already lit up a fork in this technology tree.

"How?"

Whether he was stunned or surprised, Bai Yi was really happy for Qin Xiaowei, and at the same time he was also very curious, how did this guy who was stuffy on weekdays do it, but Bai Yi's curiosity, in the face of Qin Xiaowei's conciseness, was destined to hit his head and bleed, because Qin Xiaowei's answer was very concise: "Forget it!" ”

"I ask you how you do it!"

"Pen, straw paper, and calculator!" This time he said a lot and was very detailed, but Bai Yi was really going crazy, he asked about the steps and methods of calculation, but Qin Xiaowei said that it was a tool for calculation.

However, looking at Qin Xiaowei's flushed face and the knowingly inquiring eyes, Bai Yi could only sigh helplessly, he was a good student, but he was too boring, too second, too shy, otherwise he would not have arranged Qin Xiaowei in a branch factory that was simply straight ahead, just this kind of person, Bai Yi was not at ease when he was put there.

So Bai Yi simply didn't talk nonsense with Qin Xiaowei, and shouted directly at Tang Jichen: "Bring the things!" ”

Tang Jichen couldn't wait for a long time, and as soon as he heard that she was called, he immediately ran over with a smile, handed Bai Yi a stack of calculation drafts in his hand, and asked knowingly, "How do you know that I took something?" ”

"If he doesn't have you with him, he can hit a telephone pole when he goes out, where can he come to me, okay...... I'll take a look at the design for you! ”

Seeing that her little trick was seen through, Tang Jichen couldn't help but stick out her tongue, she was reprimanded by Bai Yi with her head and face, where can she be willing, naturally she wants to ask Bai Yi what went wrong with her automatic grenade launcher.

But if she came to the door rashly, a reprimand was inevitable, so she pulled Qin Xiaowei in, because Tang Jichen knew very well that Qin Xiaowei was very valued by Bai Yi, and he had been specializing in general-purpose machine guns all these years, so he must be insured by pulling Qin Xiaowei.

And in fact, as expected, Qin Xiaowei's performance was as amazing as ever, and it also allowed Tang Jichen to find an opportunity, but Bai Yi didn't have the heart to smile like a little fox Tang Jichen, after getting the calculation draft, he just weighed it lightly, and knew that there was definitely a lot of content in it.

Flipping it open, sure enough, Qin Xiaowei did not try other automatic methods before determining the automatic principle of the semi-free bolt machine, but after a series of unsatisfactory attempts, those automatic methods were denied by him one by one, and finally only the semi-automatic bolt automatic mode conformed to the accurate, stable and efficient characteristics of the ball locking mechanism.

If an ordinary person looks at this calculation draft, he will definitely have a headache, because it is almost densely packed with numbers and calculation formulas, but who is Bai Yi, his own mathematical attainments are not bad, not to mention that Qin Xiaowei still uses the finite element that Bai Yi gave him.

Therefore, although Bai Yi is not so pleasing to the eye, he is not so incomprehensible as to nothing, and the mathematical language that demonstrates the principle of gas conduction and barrel recoil automaticism is secondary, and the most attractive thing for Bai Yi is the demonstration of the principle of semi-free bolt automatic.

Qin Xiaowei's method is actually very simple, that is, to divide the bolt into two parts, the nose and the fuselage, the two are organically integrated together with a firing pin, and an oblique L-shaped wedge iron is made above the nose, which is connected with the re-entry spring above.

When the bullet is fired, the strong impact of the gunpowder pushes the nose backwards, and the rear seat of the fuselage behind it is 1:5, so the recoil travel of the fuselage is 5 times that of the nose in the process of backward and inward movement of the roller.

Because the rear seat of the fuselage is faster, the head buckle is released. When the recoil stroke of the nose is slightly greater than 2 mm, the roller completely leaves the locking groove of the barrel clip. Thereafter, under the action of after-effect pressure, the entire bolt is recoiled together, but the relative displacement between the nose and the body is maintained at about 7.5 mm. During the recoil, the body overpowers the hammer and compresses the reentry spring. At the same time, the cartridge case hit the shell throwing arm and was thrown from the right side of the gun. When the tail end of the fuselage hits the buffer, the bolt recoil stops.

Then, under the combined action of the buffer spring and the reentry spring, the bolt is re-entered, and the nose takes a round from the magazine and pushes it into the chamber. The shell hook is stuck into the bottom groove of the bomb, and the nose stops re-entering. The body continues to re-advance, closing the gap of 6mm between the nose and the body.

Under the action of the locking wedge, the roller is re-squeezed into the locking groove of the barrel sleeve. At this time, the nose buckle is snapped with the convex shoulder on the nose, and the gun is ready to fire again.

Due to the unique smoothness of the ball locking mechanism, coupled with the release of the bolt's own recoil, and the layers of counter-entry springs, the combined force of the three makes the recoil of Qin Xiaowei's general-purpose machine gun controlled in a very reasonable range, coupled with the moderate power of the 7.62mm bullet, the accuracy of the whole gun is extremely good!

It is no exaggeration to say that the ball locking mechanism and the semi-free bolt automatics are the undisputed best combination!