Cleaning of carbon deposits on bolt parts illustrate：

After the bullet is fired, carbon deposits will accumulate in the bolt parts. If the carbon deposits are not removed and kept clean, the bullet will be easily jammed during target shooting. After the ammunition chamber is fired, the thrust force is insufficient or excessive, which is one of the reasons for the gun to explode. . 
Clean the main body of the bolt: first drip the oil into the gun barrel, then insert it into the barrel of the bolt. Wait about 10 minutes for the carbon deposits to soften. Then use a steel brush or steel needle to clean the tube and scrape the carbon deposits. It will be clean immediately! After the gun is disassembled, the exhaust hole inside the parts is also a black part with carbon deposits. In the same way, tie the medicine bag to it with a rubber band. After 10 minutes, the black carbon deposits will soften and you can use the medicine bag again. When you rotate it by hand, the carbon deposits will fall off, making it easy to clean!