Pepper ball gun is a special weapon, and the pepper ball shot it emits contains powdered tear agent, which can control and disperse troublemakers. This kind of weapon is a non-lethal weapon, which will not cause serious harm when used, but can cause some pain and discomfort.The design and use of pepper ball guns need to be cautious and must comply with relevant international and domestic laws. In addition, it is necessary to take appropriate measures to protect non-combatants such as civilians and police to avoid unnecessary suffering and harm.The history of pepper ball guns can be traced back to the United States in the 1980s. At that time, some police departments began to use pepper ball guns to deal with some protests and riots. Since then, this weapon has been widely put into the civilian market and used by some people for defense.It should be noted that the pepper ball gun is not a perfect weapon. It has some limitations, for example, it can not cause serious injury, but it can cause some pain and discomfort. In addition, it is necessary to have certain skills and experience when using the pepper ball gun, otherwise it may cause excessive stimulation or unnecessary pain to the target.In a word, pepper ball gun is a special weapon, and it must be used in compliance with relevant laws and ethics, and appropriate measures should be taken to protect civilians and non-combatants.