The United States has 4x the number of guns per capita than any of the countries you've listed. Just taking Norway, the rate of handgun ownership is also significantly higher in the US.
It could be the case that below a certain threshold, further reducing firearm availability does little to affect crime, but the US is probably far from that level
I would suggest that ownership and “gun culture” are closely related. A gun culture like Norway’s, where there are greater restrictions on registration and purchase of firearms, would probably lead to a reduction in firearms if applied to the US.
It could be the case that below a certain threshold, further reducing firearm availability does little to affect crime, but the US is probably far from that level