Now I can understand this idea very easily. Since like everything else here in the USofA. We are always looking to enhance and improve everything possible.
So why not take an semi automatic pistol and increase its length. Then according to that theory . It will have a longer sighting area thus improving its accuracy.
Also the longer length will help increase the ignition of the powder charge. That then increases the velocity/ range / hitting power of the bullet. So off it went to town !
Here is some more information about the results.