Is it illegal to wear/own the kind of protection the man had? If not, maybe we should sell a few guns and buy some body armor of our own.
It's not illegal to own any of the gear he had except for the explosives.
you can buy quality body armor online. There's nothing illegal about it. They just don't sell the current military issue plates. Price is the only thing that would deter anyone from owning armor.
Also Shooting the ankles is ludicrous. Yes it would work. It would work well. You're never going to realistically stress-fire a shot into a moving person's ankle (intentionally) with any handgun that you'd be carrying.