At least Finland's stats are a bit misleading. They are using number of guns per capita, not number of households with guns (and might also be using number of permits instead of number of guns, same gun might have more than 1 permit). There's about 650 000 permit holders in Finland, i.e. about 12%. Of course there are some people who have access to illegal guns but I don't think that's very high number. Estimates I see for number of illegal guns (which include deactivated guns which can be reactivated) are from 35 000 to 200 000.