As the representative of the oldest air tools, the earliest air guns can be traced back to 1580, when air guns used air pumps rather than air compressors to compress air. Although the design of the early air guns was far inferior to today's air guns, the shooting speed of the air gun projectiles could have reached 200-300 meters per second at that time, which was extremely amazing.
The biggest difference between air guns and common firearms is that the kinetic energy source of the projectile is different. Firearms rely on the high-energy expansion gas generated by the intense combustion of propellant and other propellants to push the projectile. The energy comes from the chemical exothermic reaction. The air gun uses the gas pressurized by the air pump to eject the projectile, so the gas pressure generated by the air gun is much lower than that of the firearm, and the power of the air gun is usually weaker than that of the firearm.
Although the power of air guns is weaker than that of firearms, early air guns generally appeared on the battlefield due to their greater power, no flash, no smoke, and their ability to be used on rainy days. Nowadays, some powerful air rifle bullets can even reach 330 meters per second. Many national firearms regulations restrict this type of air rifle.
China air gun can actually cause fatal harm to people or animals. Perhaps the airsoft bullets hit the torso and will not cause fatal injuries, but once they hit the head or other important organs and tissues, it is basically difficult to rescue them, too.