Comparing your proposed 30000 guns in France with more guns than inhabitants in the US.
Yes people get guns here in Sweden. You see it on the news almost weekly sometimes how gang members shoot each other. Smuggled weapons or imported plugged weapons that have been modified into live firearm.
This argument still does not negate the fact that it's much harder to get your hands on a working firearm. And that makes all the difference in crimes of passion.