FlatAss! I think you are watching too much Hollywood and being infected by American paranoia and stranger danger, unless things are different than the rest of Europe, none of this semi or full auto, flak jacket, ceramic spiderweb, hollow point, quick draw gun masturbation will be of any use to you.
Unless the Russians come, in which case you will be toasted by some remote drone driven by an outsourced 6-year-old in Pakistan before you know what is going on.
Spend the money on coke and hookers.