Look at swiss, everyone has weapon there since recruit army time
I know I am late to the party, but as swiss who did military service and having had an Assault Rifle in my closet for 10 years, I want to clarify a little bit on that.
Yes, a lot of swiss men (and also a few women) have a military weapon at home. Not just pistols, assault rifles, unmodified ones at that (thus capable of fully automatic fire)... most of these rifles though will dissappear from these households after the active military service though, as the swiss military changed the rules on who can keep their military service weapon after finishing their service time.
So now, you need to prove you were taking part in civil shooting competitions (there is one big competition every year that is partially supported by the military) for at least the last two years before finishing your service time, you need to pay a small sume for the weapon now (100 bucks, nothing outrageous (given the Stgw90 costs around 1000-2000 bucks on the free market), and quite fair given they need to modify the assault rifles to block automatic fire modes which are forbidden in civil weapons, still, this was completly free of charge before).
I expect the amount of people that will keep their weapon after their service time will drastically fall from 70-80% (pulled out of my a**, basically only people that didn't like having a weapon in their closet were giving it back before (or people pushed by their GF or Wife who didn't like it 
)) to around 10-20% (pulled out of my a** again, but seeing how even guys that like weapons and military stuff seldomly can be bothered to participate in shooting sports in their own free time, I don't see many people starting to attend these competitions just for keeping a weapon with possibly a lot of knocks and chipped off paint (at least for the infantry guys )).
There has been only one incident with someone shooting another person with a military weapon where the weapon owner was actually the person that got the wapon in military in the last 20 years I can remember...
But you need to remember, anyone who got their weapon through military had to go through at least 15 weeks of basic training, and will be forced to do another 3-4 weeks of training every year or so for another 7 years at least. When people take their weapons home for the first time, they had to have thourough drills on the safe use of weapons, safe stowage, cleaning, manipulation, and so on... and at least in infantry, we had also experienced a lot of theoretical education on the effect of bullets on the human body (and sadly also some less theoretical ones, but such accidents are actually surprisingly rare).
So most poeple in switzerland owning a weapon only got it attached to a very intense training on the use of the weapon... which will likely decrease the chance of this person having a gun related accident (altough I am still amazed about the amount of people shooting their own foot while cleaning a weapon ), and IMO als decreases the chance the person will want to actually shoot anyone with the gun... if you see images and descriptions of wounds caused by modern assault rifles, you start to really get that these rifles are NOT a good tool for civilian self defense (might as well use a shotgun with explosive ammo)... and you might also be waking up to the truth that shooting someone is NOT a non-lethal way of self defense.
Add to that the fact that while swiss soldiers still keep their weapons at home, the soldier isn't allowed to store ammunition for their weapon at home. originally every soldier got a can with 50 shots home, so they they would already be armed when called for active service in a crisis (military hardliners though that some tree-huggers might want to stop them from reaching their troops, so that is who these bullets were intended for), but that practice fell out of public favour with lots of leftwing people seeing these military weapons as a huge problem. You CAN get NATO 5.6mm rounds easely in switzerland, as these assault rifles are used a lot in sporting competitions, and many have "stolen" these round in military or at competitions. Still, you need to aquire ammunition yourself, which is too much hassle for many people.
Some leftwing guys tried to force soldiers to keep it at military stowage facilities while they were not in active service, but that was rightly shot down as getting your weapon before military service and putting it back after would have added a lot of hassle solely burdened on the soldier.
The last fact to take note of is that every military weapon has a number that can be linked to its legitimate owner. Every part of the gun shares this number, if you mix up the parts during active service, you are in big trougle. So everyone getting out of service and still possesing such a gun will own a gun that the state knows EXACTLY who it belongs to.
EDIT: oh, and I almost forgot... you also need a "weapon permit" (don't know what the correct english translation is for that), which is a paper that grants you the right to posses a gun (not to carry it or actually aquiring one, whose are separate permits).
Not that hard to get, every swiss citizen can apply for it, and given they have no criminal record and pay the fees they will get it.
Still, another step on they way to be able to keep your military weapon at home. Meaning the guys that should never have gotten a weapon (because every dork seems to be acceptable for military at a time when more and more try to circumvent the draft) will most probably fail that step (as they might have a record) and might be forced to give back their weapon.
So yeah, a lot of people have guns in their closets in switzerland (though most of these are assault rifles, not really a practical tool for self defense anyway), and not much harm is done with these weapons.
But these are highly regulated weapons, modified for non-automatic fire, clearly numbered, and owned by people that actually know how to use them (which most of the time is a good thing, because it makes it leass likely they WILL use them). Not really comparable to the situation in the US, even though my knowledge about that is fuzzy.
What no statistics will tell you is where these weapons will end up. I guess many swiss assault rifles end up in foreign hands, the Stgw90 is a quite expensive and formidable Weapon, and cheap to anyone who got it through military, so they can sell it for a low price and still make lots of money. This got regulated a lot in the last few years, but I think it is still legal.
Would be interesting to see how many Stgw90 produced for the swiss military turn up in active warzones around the globe... quite a hot topic in swiss politics as switzerland bans ALL weapon exports into active warzones.
