"You can't grow guns, Guns are not addictive, While I agree a black market would always exist its much easier to control when walmart does not sell them at discount prices. Lets face it most of the violent criminals aren't in the upper income brackets, if guns are expensive because they are illegal they will be less pervasive"
I can go out, right now, and get an AK-47 off the street for <$500, that's a completely illegal gun, brought into the country illegally, purchased illegally, and is most likely to be used illegally... and it costs just about the same as a legal one (only the illegal one is fully automatic while most legal AKs have been modified to only be semi-auto)... there's no markup because it's illegal. $500 is "walking around" money for even low level weed dealers, you get up into Coke suppliers, the guys who actually shoot stuff up, $500 is nothing. Making guns illegal isn't going to make it any harder for criminals to get.

I'd like to see a breakdown on the number of crimes involving a gun committed by said gun's registered owner... I'm guessing it would be pretty close to nill.