It works when implemented country-wide. Countries like Germany have much stricter gun laws, and as a result lower gun violence.
Obviously, the method doesn't work, when someone who wants a gun can just drive a couple hours and get one at some gun show without even leaving the country.
https://en.wikipedia.org/wiki/List_of_countries_by_firearm-r...
It works when implemented country-wide. Countries like Germany have much stricter gun laws, and as a result lower gun violence.
Obviously, the method doesn't work, when someone who wants a gun can just drive a couple hours and get one at some gun show without even leaving the country.