How about this as a gun control argument. Lets look at Canada, France, England or most other first world nations. They have just as many guns when it comes to rifles, etc however they don't have nearly the same amount of hang guns. I assume based on the numbers I have seen that in other first world countries rifles and shotguns make of the difference for the lack of handguns. Also they have a much lower rate of death as a result of gun crime and even assults of other types such as stabbing, beating, etc.
So if you reduce the total pool of handguns without actually changing the numbers of guns owned by the populace you have now proportionally reduced the number of deaths as a result of Gun crime, even if the total number of assults stays the same.
I'd be against any reduction of handguns. The older I get the less I want to be lugging around a rifle or a shotgun. Besides, I'm partial to revolvers.