The door of the courtyard house has been welded dead

It's early morning, and it's not time to go to work yet.

At the research institute, a tricycle drove in stealthily.

The security guard at the door quickly closed the door after the vehicle entered.

The finished bulletproof plates are neatly placed on the warehouse shelves in the ceramic workshop, with some space between them to allow the glue to dry effectively.

The plug boards have the same shape but different thicknesses, including 1.5 cm, 2 cm and 2.5 cm. They have a slightly curved surface and are ergonomically designed.

The thickness of the alloy back plates is the same, but the thickness of the ceramic plates is different, resulting in different weights. As for the bulletproof effect, we will know when we go to the shooting range.

The workers in the ceramic workshop didn't know why the ceramic sheets had to be pasted on the alloy back panel and why a layer of cloth was glued on the outside. They didn't have time to think about these things now, and applying glue was quite troublesome.

After stacking the drying boards on the tricycle and covering them with canvas, they sneaked to the security department again. The officer on duty, Li Tianxing, brought out a box of bullets, picked up the Type 56 submachine gun and the Type 56 semi-automatic rifle, climbed into the back bed of the tricycle, and headed straight for the shooting range.

"Red Star 787 Factory: Regarding bulletproof inserts, the first phase of research and test log"

Mr. Shen woke up early and watched the security personnel loading the magazine. There was black paint on the tip of the bullet, which was the mark of an armor-piercing bullet. He yawned, picked up the notebook, signed it, and waved his hand.

The bulletproof plates on the tricycle were placed in front of the ravaged concrete wall, arranged in order from thinnest to thickest and from left to right.

"Ready, request to fire~!"

"You can fire~!"

"Da, da, da~!"

The semi-automatic rifle pulled the trigger first and fired a burst of shots at a distance of 50 meters. Liu Guangqi, who was standing nearby, held a telescope and watched the effect after the hit.

With a hit rate of 56, he can basically reach % at a distance of meters. If he still can't hit the target at a distance of meters, he, as the section chief, will have to roll up his sleeves and scold people.

Fortunately, Li Tianxing, who had served in the army, had reliable experience in shooting.

The moment the bullet head hit the bulletproof plate, milky white ceramic fragments flew out from the gap. The collision sound of copper and steel was crisp and pleasant, tinkling like a skilled worker forging iron.

This is a 1.5 cm bulletproof plate. The alumina ceramic is still a little thin. Facing a steel core armor-piercing bullet, it feels like being stabbed directly in the kidney.

When it came to the two-centimeter-thick plug plate, the sound of the bullet impact became a little duller, and the number of ceramic fragments flying out of the gap was much less. Through the telescope, one could see thumb-sized bullets shooting into the entrance.

With a bulletproof plate that is 7.62 centimeters thick, it will be completely indifferent to mm caliber armor-piercing bullets.

After the first round of shooting, Liu Guangqi, Mr. Shen, and Li Tianxing, who was in charge of shooting, walked to the concrete wall one by one and scrambled to look at the back of the bulletproof plate.

"Number one is pierced~!"

When Mr. Shen picked up the thinnest piece, he could hear a rustling sound coming from inside, which was made by the broken ceramic particles rolling in the internal pores.

Mr. Shen smacked his lips, his expression showing a hint of regret.

Because light could penetrate the bullet hole, he poked it with his little finger.

The alloy plate on the back of the bulletproof insert was completely deformed, with a fist-sized dent created by the kinetic energy of the armor-piercing bullet.

The depth of the dent means that even if the vest is not penetrated, the ribs of the personnel wearing the bulletproof vest will be broken. If the broken ribs puncture the lungs, the personnel will lose their combat effectiveness.

If the thinnest insert can be used to protect against the kinetic energy of armor-piercing bullets, the bulletproof plate representing the Red Star can meet the requirements in the initial design.

It’s a pity that the expected optimal results were not achieved, and Mr. Shen was a little disappointed.

"Number Two, block it~!"

Compared to Mr. Shen, Liu Guangqi was more excited. The two-centimeter-thick insert lived up to expectations and resisted the penetrating power of the armor-piercing bullet.

The alloy back panel bulged slightly, and the glue coating had separated at the hit position, and the ceramic had slightly expanded and cracked outwards. However, the inner alloy plate was slightly concave inwards, blocking it. A clear mark of the impact point could be seen on the back, but it was still blocked.

Liu Guangqi turned the plug board over and knocked it with his hand. Ceramic fragments and bullet fragments were poured out from the entrance. It could be seen that the steel core was really deformed.

"Let me take a look. It's pretty good. It's six kilograms. It's not too heavy!"

After taking the plug board from Liu Guangqi, the disappointment on Mr. Shen's face disappeared immediately and the smile returned to his face. This assessment result, at least, passed.

Secretary Li was so ruthless at the beginning and used armor-piercing bullets for testing. As the deputy factory director, he was unsure at first because these things were not made by him. After seeing the test results, he gradually felt relieved.

"Chief Liu, why did you use armor-piercing bullets right away? The security department doesn't have many. Can't you use ordinary bullets~!"

Li Tianxing was also full of doubts. Others didn't know the difference between armor-piercing bullets and ordinary bullets, but he, who had fired them before, knew them very well.

Logically, shouldn't the tests be conducted from simple to difficult? It is too confident to directly use armor-piercing bullets for the test.

Liu Guangqi didn't know about this either. When Li Tianxing was in the army, he had fired a lot of armor-piercing bullets himself. Before Liu Guangqi went to the security department, he had never even touched a gun. Even though he didn't know, Liu Guangqi couldn't admit it in front of his subordinates. He silently picked up the third plug board and studied it.

Compared with the previous two pieces, the performance of this one is even more eye-catching. There is no bulge on the bullet-proof insert surface, and there is only a slight bulge on the alloy back.

Compared to the second piece which is two centimeters thick, you can still clearly see the impact point on the back, but this third piece doesn’t even have a impact point, it is so stable that it is terribly stable.

"Continue the experiment~!"

Mr. Shen was speechless at this time. Fortunately, he brought armor-piercing bullets. If it was ordinary bullets, it would probably not be penetrated from the first piece.

The test logbook had to clearly record the results of the first round of shooting. This was the first round of testing, and we used highly difficult steel core armor-piercing bullets.

I don’t know what the superiors would think when they see this test log, but in the eyes of Mr. Shen, the data is very impressive.

This is the confidence of Red Star Factory and also the confidence of Director Li Feng.

When faced with bulletproof vests designed by research institutes of other units, we can use dazzling data to tell them that you can stop and go research in other fields~!

The summer wind was a little hot. The bulletproof plates were placed in their designated positions, shattered by bullets, flew up, and then fell to the ground.

At the beginning, it may feel a bit fresh, but after the freshness wears off, it starts to become boring.

The Type 56 semi-automatic rifle can only fire in bursts. When the Type 56 submachine gun is used, the continuous and continuous sound of shooting echoes throughout the shooting range.

Li Tianxing's short burst shooting was very accurate, and the test results were recorded in a notebook.

The 1.5 cm thick bulletproof plate was still not enough to withstand armor-piercing bullets and was deformed by continuous shooting.

The two-centimeter-thick bulletproof insert is very effective. Even if the back plate is deformed by the bullet hammer, it still maintains stability and will only be penetrated when the number of bullets reaches four or more.

The 2.5 cm thick alumina ceramic is already so stable that it is somewhat frightening. There is a risk of penetration only if bullets hit the same bullet hole at the same time, but the probability of this is really too low.

In just one morning, more than a hundred bulletproof plates in the tricycle were used up. Li Tianxing covered his shoulders, feeling both pain and joy.

In the independent warehouse of the institute, the bulletproof plate that was towed back by the tricycle was partially disassembled, and for the other part, the bullet holes were circled and marked with chalk on the edge with 7.62-7N24, which marked the bullet type.

After taking photos and archiving them, you can tell the effect of the bulletproof plates by just looking at the photos. These bulletproof plates that have been tested will be piled up here in the future until the day when the pile is full.

Factory director's office.

Li Feng was holding the tactical vests that Chief Jin had developed based on his own designs, and was trying them on one by one, giving his opinion.

"The handle on the back of the neck is well designed and clever. It can be easily dragged by comrades. It's very thoughtful, Chief Jin~!"

Compared with the improvement suggestions given by Li Feng before, Section Chief Jin obviously listened to them and also added some ideas.

"Dang Dang Dang~!"

The two people who were discussing looked towards the door at the same time, and Liu Guangqi poked his head out.

"Secretary Li, the test results are out~!"

Seeing that Section Chief Jin was also there, Liu Guangqi nodded and greeted him, then handed in the test log.

He was curious about the several tactical vests in the house and was eager to try them out.

"Then I'll go back first, Secretary Li~?"

However, Section Chief Jin did not give Chief Liu the opportunity to try it out himself. He put the vests back into the box under the coffee table, stood up and was about to leave. He was very considerate.

Liu Guangqi did not leave after delivering the documents, proving that he had something to say.

Li Feng, who was flipping through the test log, raised his head to look at the box in Section Chief Jin's hand. From the details, it can be seen that Section Chief Jin is still relatively cautious and does not trust anyone.

"The third set is the one with smooth front and back. You arrange for someone to make a few of them temporarily. I have to take them away this afternoon~!"

He waved his hand, indicating that Section Chief Jin could leave. As for where to take him, Li Feng did not explain further.

After Section Chief Jin left, Liu Guangqi stayed in the office, waiting for Secretary Li to finish reading the test log before he asked the questions in his mind.

"Do you know why I specifically applied for these boxes of armor-piercing bullets?" Liu Guangqi shook his head tactfully.

Li Feng did not give any further explanation. Instead, he walked to the desk, picked up the phone on the desk, and started making a call in front of him.

"Hello, Beijing Investigation Department, Operations Division 2~!"

"Old Shen, the stuff is ready. Tell Old Zheng that the Type 56 ordinary bullet is looking down on me. I tried it with the 7N24 armor-piercing bullet and it worked well. Bring a few this afternoon to open his eyes~!" (End of this chapter)