The multiplier for all firearm-related deaths between the US and EU average for example is around 12X, more than an order of magnitude [1].
The elephant in the room however is that the main argument simply doesn't hold up. Owning a gun doesn't just make the owner slightly more likely to get shot, but also everyone around them [2]
Or, as they say: The only thing you need against a bad toddler with a gun is a good toddler with... nah, not going there. Too sad actually.
Statistic after statistic says clearly that a society with more guns is less safe for everyone (the Switzerland outlier is easily explained by banning of owning munition instead of guns in peace time).
I wish Americans could get a feeling of how different a society without a perpetual feeling of danger and paranoia feels like. Where children just go to school without security checks, amok drills and bulletproof safe rooms.
Seriously, that just rocks.
[1] https://en.wikipedia.org/wiki/List_of_countries_by_firearm-r... [2] https://www.hsph.harvard.edu/news/hsph-in-the-news/do-guns-m...