This is going to cause a stir. MAC and the Military Arms Channel compare the performance of the FN Five-seveN and the Kel-Tec PMR-30 with gel and popular body armor. Thrown in for good measure is a PS90 SBR as a baseline for FN5.7x28mm performance out of the firearm it was actually developed for.
I would love to see this revisited with a .22 Magnum SBR for good measure, but I’m sure the number of those floating around the country number in the single digits.
If you really think that the Five-seveN is a capable self-defense firearm you should definitely watch this video.