I posted this in your other thread of the same subject:
The Five-Seven round isn't nearly as popular as the big four (.40 S&W, .380, 9mm, and .45ACP), so it's usually more readily available.
I only know one guy that has one, and he loves it. It's a little big for concealement, but that's never stopped anyone.
Take note, many indoor ranges do not allow the 5.7mm NATO round to be fired at their facility because of insurance-imposed restrictions.
Awesome gun, if you can find a place to shoot it.....