Perhaps Dagu and others gathered in the store so that passersby outside the window could see the liveliness of the store, and at night, there were sporadic passers-by who chose to come in for a drink.

Although there were not many guests, it was a good start.

When it was nearly twelve o'clock, the customers in the store had already left. Considering that it was not far from the closing time, Ye Qing simply closed the shop door. After cleaning up the in-store hygiene with Riley, drive her back to the school dormitory.

At night, the Silver Eagle Federation is far less safe than in the country. Ye Qing doesn't want any accidents to happen to his employees. Especially Riley's steadfastness and hard work, which is different from most black people, and the healing smile on the corner of her mouth. In Ye Qing's view, it is undoubtedly his luck to be able to recruit such an employee.

Ye Qing, who returned to the store hurriedly washed up, lay on the bed, and entered the virtual training ground to continue her studies. Even though the body outside was extremely tired, Ye Qing's spirit was full again the moment he entered the virtual training ground.

It wasn't until ten hours later that Ye Qing felt tired in the training ground, and then Ye Qing left the training ground and went straight into a deep sleep.

The next morning, Ye Qing woke up and didn't open the door directly, but lay in bed and recalled what she had learned last night. Thanks to the efficient and mandatory teaching brought by the system, Ye Qing's learning progress is very fast.

In terms of the appearance modification of firearms, Ye Qing has already been able to handle most of the raw materials. In terms of firearm automation principles, Ye Qing also understood the difference between short strokes and long strokes of those pistons.

In general, the automatic principles of firearms are mainly divided into four categories. That is, the barrel recoil type, the bolt recoil type, the gas type and the hybrid type.

In the development of the world's firearms history, the manual machine gun invented by Belgian Fa Shang in 1851 is undoubtedly the originator of automatic weapons. The rate of fire of 330 rounds per minute back then shocked the world.

As if by a coincidence, 33 years later, it was 1884. The famous Mark Qin heavy machine gun came out. Since then, in 1892, Austria took the lead in developing the 8 mm Schoenberg pistol, which was also the world's first automatic pistol.

The automation of pistols and machine guns is much earlier than rifles, and the technology used in this is the recoil of the barrel.

Simply put, the automatic way of using the gunpowder gas pressure in the gun chamber to make the movable parts in the firearm and the barrel recoil together and complete the automatic action is the barrel recoil type.

In this case, Ye Qing only focused on the short recoil style of the gun barrel. Because the other branch, the long recoil barrel, has been abandoned by the times. However, the reliable performance of short-barrel recoil firearms, small recoil, high shooting accuracy and theoretical high rate of fire can be retained.

The very famous 1911 pistol uses this structure.

The so-called short stroke type and long stroke type of the piston that I saw before belong to the category of air guide type. And this automatic method is more used for modern firearms, and it is also the main focus of Ye Qing's study.

After reviewing the knowledge, Ye Qing couldn't help but think of the AR-15 that was exchanged from the system. Ye Qing's exaggerated performance has always made Ye Qing brooding.

Looking at the time on the watch, it was still an hour before the door opened. Ye Qing couldn't hold back his curiosity any longer. He got up and went downstairs to find the gun bag with the AR-15, and lifted it to his room to open it.

Remove the magazine, open the upper cover, drop the stock, then take out the recoil spring and the goggles outside the barrel, and finally pull out the barrel and the moving parts inside the gun body.

Combined with the knowledge taught by the system, Ye Qing is not difficult to recognize. There is no obvious difference in the automation structure of the AR-15. The extremely long air-guiding chamber extending from the side of the barrel, and the piston stroke that is almost synchronized with the movement track of the bolt, all indicate that this gun is still a long-stroke piston rifle.

Even the locking mechanism is exactly the same as the roller lock originally designed by Mr. Stoner. So the question is, why is the performance of the gun produced by this system so much higher?

As the saying goes, Zibuyu is eccentric and chaotic, even though his system of living is very mysterious. But after getting along with the system for the past few months, Ye Qing gradually understood. This system will not open itself up for no reason, or in other words, the rewards it rewards to itself, or the help it provides to itself, are purposeful, and they also need to pay a certain price.

It seems that the performance of the guns produced by the system has improved by leaps and bounds. In his own shop, the purchased guns were still unremarkable. If the system improves performance in a way that I don't understand at all, then it makes no sense that other guns in the store don't enjoy this.

Thinking of this, Ye Qing went downstairs again, found an AR-15 produced by Colt from the warehouse and went upstairs. After unpacking, wash off the gun oil first, and then disassemble the gun step by step. At the same time, it is compared with the AR-15 produced by the system on the same desktop.

A gun on top, a gun on the bottom. Such an intuitive comparison, coupled with Ye Qing's method of dismantling one part and comparing one part, quickly found the difference between the two.

The AR-15 produced by the system has one more component!

Looking at a small funnel-like part placed on the table, Ye Qing frowned and fell into thought again.

Needless to say, Colt's AR-15 has nothing suspicious about the direct-blown air-guiding structure. After all, this old gun of the last century has already passed the property rights protection period, and you can find the design structure of this gun by just searching on the Internet. UU reading www.uukanshu. The com part is definitely not on the original AR-15.

After clarifying this idea, Ye Qing continued to recall the previous process of disassembling the system version AR-15 in his mind. After about three minutes, Ye Qing finally thought of it.

"A funnel is added to the air guide?"

Ye Qing murmured suspiciously. The gas force generated by the explosion of gunpowder in the gun chamber is not too small. If such a funnel-shaped thing is added at this time, will the pressure on the inner wall of the gun chamber be too high and the risk of explosion occurs?

While pondering, Ye Qing loaded the rifle. Yes! Material!

After loading the rifle, Ye Qing remembered another point of the AR-15 system version that he almost ignored, and that was the weight problem. The normal AR-15 cover, the position of the gun body uses a lot of aviation aluminum. This material is not heavy in the first place, and the system version of AR-15 feels similar to the material, but the weight is much lighter.

Thinking of this, Ye Qing also understood the difference between the two. One is structural change, and the other is the application of new materials. If you want to achieve the first point, you must make a breakthrough in the second point, which is the material. Otherwise, suddenly adding a gas-gathering component to the air-guiding chamber will only be counterproductive.

In this way, it can be deduced that the hardness and toughness of the material used on the gun of the system must be higher than that of general aviation aluminum. So, another opportunity?

No, it should be one more course. Materials science, and here you need to learn chemistry...

Ye Qing suddenly had some doubts about life...

I'm afraid this system will have to be renamed the Xueba system. In addition to receiving a sum of money at the beginning, it seems that he has been learning in it. A good plug-in life turned out to be just a high-tech cram school...

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