Gun Control has little to do with crime control, but concealed carry is the most effective anti-crime gun law according to recent reports.
Here is what does work, background checks/buyer screening, regulation of dealers, stricter penalties for committing crimes with guns, and easier concealed carry for law abiding citizens.
It is not guns that are a problem or even how many people own them or how many guns. It is guns in the hands of criminals and a lack of them in the hands of the law abiding that are the issue. If you want less crime, have more probation/parole searches with the police, monitor those who are criminals and violate them if they do not obey the law. Put people away who commit felonies with guns. Do not bother law abiding citizens.