"ONE SECOND" principle
As mentioned, technically we are speaking of a shot delivered in the time frame of 1 second or less, depending on the distance ranging from 10 to 300 meters at a torso-size target. It is definitely possible but requires special training. This is how “one second drills “ were born.
A "punch-like" shot at a CQB distances really does look like a punch and is less than 0,50 sec:
After these Half-second shots, the shots slightly under a second do not feel fast any more:
We fight as we were trained. If you are trained to shoot from a stationary position you will do so. If you were trained to explode into movement while mounting the gun and make the shot while making the 1st step your chances increase dramatically.
"MORE THAN ONE SHOT"
We normally shoot more than once in a firefight. The ability to make fast consecutive shots at the rate close to fully-automatic fire - at a single or multiple opponents - is also critical: