[rdavl]

Mass killing is perhaps a bad choice of words, but you really shouldn't be allowed to own any kind of automatic firearms, silencers, military sniper rifles.

Nor should anyone be allowed to keep home any amount of explosive substances or explosive devices, unless for professional use, or any kind of chemical or biological weaponry.

Also, you could not own any kind of firearm if you have criminal record, poor eyesight, mental retardations and such.

No ownership is possible without having a licence issued by the government.

Those are basically regulations in Croatia for example.