You’ve glossed over how someone would get caught. Storage is done in private residences, so in order to catch someone you’d need to search their homes.

Regular searches would be unreasonable. As well as any searches just because they own a gun. The only time someone would be charged for this is when another search of the home would be conducted. The law wouldnt protect anyone nor would it increase safety or lower the rates of crimes, but add more charges to someone already being arrested. It would only inflate prison times.