Targeting legal gun owners won’t stop criminals from carrying firearms.
Please compare the percentage of crimes commited with a firearm versus all crimes commited for the US and countries that have functioning laws limiting private gun ownership. In Germany (population about 80.000.000) in 2022 there were about 200,000 “crimes against personal freedoms” (this number is probably too low because I only added the numbers for the two main types of these crimes). In about 4500 cases (of all crimes) a gun was used to threaten somebody and in about 4000 cases (of all crimes) a shot was fired. So in the overwhelming majority of violent crimes (about 96%) no guns were used.