Gun Tests did an compairson (November 2011 / vol XXIII no 11) between the FNH FiveseveN (Gun Tests grade: B), and the Kal-Tec PMR-30 (Gun Tests grade: A) on page 23.
Short Version they likes the PMR-30 better, higher availability of more ammo types, firearm cost, and other things. What was interesting was the chrono data, not the huge difference one would assume between the .22 mag VS the 5.7X28... They were acceptably close, and the .22 mag is a whole lot cheaper to shoot....
"The sword dose not cause the murder, and the maker of the sword dose not bear sin" Rabbi Solomon ben Isaac 11th century
"Don't be so open minded that your brains fall out!" Father John Corapi.