In the early sixties the government was experimenting with Personal Defense Weapon designs which used sawed off little .22 cartridges just like these. Erratic performance from short barrels was just one of the problems encountered. I was surprised when FN first marketed this series, to me it seemed a resurrection of a concept which failed 40 years earlier.
Well, it does do one thing right - with the AP ammo, it will zip right through body armor, which was the point of the cartridge, and which 9mm AP generally won’t do.
Unfortunately, it doesn’t seem to do anything else well.
Continued: If he really wanted to go to town and preserve his options, he should have gotten something like the OA-93, which fires the 5.56 NATO rifle round in a ‘pistol’. That would have worked on armored and unarmored personnel just fine.
Sometimes you must praise God for the opponent’s incompetence...