Paintball Guns How Do People Shoot Paintball Guns So Fast?

How do people shoot paintball guns so fast? - paintball guns

I frankly admit that I am a rookie for a total of paintball. I have a Smart Parts Ion, and I'm going with my friends from school play every month. I'm looking for the guys to play professionally, but how on earth have they fired their weapons quickly with two fingers? Is it a kind of technology, because it is incomprehensible to me.