Firearm related deaths per 100,000[1]:
Germany: 0.065
US: 4.054 (62.4x higher)
Firearm ownership per 100 people[2]:
Germany: 19.6
US: 120.5 (6.15x higher)
If those stats are to be believed there's approximately 10x firearm deaths per gun in the US compared to Germany.
[1]: https://en.m.wikipedia.org/wiki/List_of_countries_by_firearm...
[2]: https://en.m.wikipedia.org/wiki/Estimated_number_of_civilian...
Then you have safe gun storage, which is mandatory in Germany and is subject to routine inspections.
It is also mandatory to have an ownership license for any type of gun. You will be automatically denied this e.g. if you are formerly convicted of a serious crime, have mental health issues, or a history with drug use or violence. And you need to provide a reason for owning a gun, where "self defence" does not count.
If you can prohibit people from owning guns made for killing lots of other people, and prohibit people who obviously should not own guns from getting them, you've made substantial progress.
Videos of unlicensed Germans doing this are online.
For example I know a guy that has more than 400 firearms. For him it is a business, not a passion, he does not even carry one, but he is giving a wrong impression of gun ownership.