After engaging in casual conversation, a judge I met while perusing the ammo lanes at local BassPro shop told me he always carries his FN 5.7 under his robe.
Can't say I blaim him..
I've shot 'em. They're darn accurate. Don't know how far, but I wouldn't want to be on the receiving end in a courtroom setting.
IIRC, they've got some serious velocity.