So I've worked on and shot the "destructive" version; they're not as fearsome as you'd think. The potato seldom escapes the barrel in a single fragment (unless you do a lot of tuning), and if it does, you're probably not hitting with enough force to seriously wound. That's a pretty ridiculous law, and I will probably use it in the future as an example of "nanny state gone mad", so thank you. If you ask me, this is just another case of the weapon looking "tactical".