PSM (E language: Пистолет Самозарядный Малогабаритный, meaning: compact semi-automatic pistol) is a self-defense pistol designed by the sulianKBP Instrument Design Bureau in 1969 for self-defense intended for use by law enforcement and military officers. The gun was officially put into production at the Izhevsk Mechanical Plant in 1973. The gun adopts a free bolt type automatic method, which has a small appearance and no protruding parts on the surface, which is easy to hide. It uses a unique bottlenecked bullet and a non-expanding warhead with great penetration, which can penetrate body armor.

The PSM is operated by a recoil mechanism, the board machine is a double-acting design, and the safety device is integrated with the carriage. What is more special is that this gun does not have an empty compartment hang-up device, so it is difficult for the shooter to detect that the gun has been depleted after running out of bullets. The majority of the PSM guns are made of steel, while the grip guards are made of thin aluminium sheets, but newer models use grip guards made of hard plastic.

The ammunition used in the PSM pistol is a 5.45×18mm bullet developed by the Zhongyang Institute of Precision Mechanical Engineering, which has the characteristics of high penetration, and its performance even surpasses the .22LR and .25ACP ammunition of the same type.

Explain a lot to Wu Sheng, and also make a lot of teachers for Wu Sheng, how to disassemble and assemble, Wu Sheng is also a genius, Ah Quan assembles once, in disassembly once, he can remember, Ah Quan nodded again and again, very satisfied, Wu Sheng just kept disassembling guns and assembling guns in the afternoon, and Ah Quan taught Wu Sheng to understand guns, Wu Sheng did not embarrass Ah Quan, and dismantled the guns in the entire gun room in one afternoon, and assembled them all, Wu Sheng immersed himself in the process of disassembling and assembling guns, Forgetting that he was going to pick up Feng Qianqian from school, it wasn't until Julie's voice came from Ah Quan's silver ring that Wu Sheng woke up.

So the two of them went out of the gun room, out of the secret room, and went to the outside of Marriott, Ah Quan asked Wu Sheng when he was free tomorrow while walking, Wu Sheng answered honestly, after the two of them left, an elegant middle-aged uncle walked out of a pillar of Marriott, he looked at the direction of Wu Sheng's departure, his eyes flashed slightly, he heard Wu Sheng call Ah Quan as the master, this person is none other than Feng Gang, the director of the Education Bureau, Feng Qianqian's father.

Ah Quan and Wu Sheng parted ways when they walked outside Marriott, Ah Quan drove to pick up Julie from school, and Wu Sheng also drove to pick up Feng Qianqian from school at the same time.

When Ah Quan came to the gate of Julie's school, he saw that Julie was talking to Jiang Hua, and it seemed that Julie was going to talk to Jiang Hua for a long time, so Ah Quan sat in the car and did not get out of the car to go to Julie.

At this moment, Jiang Hua was talking to Julie about the kidnapping that day, and Julie left before she could ask in detail at the Jiang family that day, so she met today and asked how she was that day, and she had been staying in the car? I don't know who saved me. Julie dealt with Jiang Hua perfunctorily, Julie hated Ah Quan to death, why didn't she come, she glanced at it casually, saw Ah Quan's car, and quickly said hello to Jiang Hua and left. Jiang Hua saw Julie get into the car, and also went to Jiang Ren's car. The Jiang family was very vigilant about Jiang Hua's commuting to and from school after Jiang Hua's kidnapping, and now Jiang Ren is driving to and from school.