I have a bullet with a length of 5.5CM and a bullet diameter of 1CM. There are 9 1 1 74 words in the same direction at the bottom of the shell. I wonder what kind of gun it is. How safe? ...

The length of the bullet is about 5.5CM, the diameter of the bullet is about 1CM, and the words "9 1 1 74" are written on the bottom of the cartridge case in the same direction. It is a semi-automatic rifle bullet, which has been popular until the end of 1980s after the founding of the People's Republic of China. The body can be fixed, and the warhead must face up, not at people. You can gently rotate it with pliers and pull it out. After pulling it out, pour out the explosives inside and put them in a safe place, and it's ok!