I believe criminals get guns through the black market (as shown by a couple of local confiscations, the guns haven't been legal since 1996) and the fact that very few stolen firearms turn up in crimes (I think the figure is ~3%, not that all firearms used in crimes are found, most used are handguns). In the USA its different as there is no degree of firearm registration

so anyone without morals can siphon firearms off. And there are that many firearms now, and firearm manufacturing groups that there is no way the USA will ever be without them (so long as you are a willing to break the law to get them).
The following is my biggest issue with excessive gun control (eg: 100% bans no matter what regulative hoops you are willing to jump through, or what you reason want a firearm for).
I don't think the terrible, criminal actions of a handful should shape a society of the many. Its not how we
usually do things. This is especially evident to me as a firearms owner, when I hear about innocent people dying every weekend or so, due to alcohol abuse, but no one batters an eyelid...can you see my reasoning?
I'd be much happier to submit to gun control if all the other dangerous things were banned as well (not that society would ever want to be wrapped in that much cotton wool - which I think is a good thing for the reasons Cisco mentioned above).
Regulation, vigilance and education are the keys in the USA, not gun bans.