I posted an article here a while back about private gun ownership in Europe. Turns out the Euros, especially northern Euros, are much more well armed than you might think. IIRC, several countries were just slightly below Swiss levels.
It was based on a wiki article, so the real numbers were probably even higher than the what the study cited.
Here you go, Wiki entry and a post.
http://www.freerepublic.com/focus/f-news/3461458/posts?page=13#13
https://en.wikipedia.org/wiki/Estimated_number_of_guns_per_capita_by_country
I suspect there are quite a few vintage weapons lying around in cellars from WWII.