Well i dont know how easy it is to purchase a firearm on the black market..
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Just like marijuana, banning them will not solve the problem and in fact would make it worse. This is how Mexican cartels are shooting troops at the borders...
Bans won't do anything to reduce the availability of certain types of guns to criminals in the short term, because there are already a lot of that type of gun in existence. In the long term (probably 50 years or more) a ban on certain types of guns will probably make them harder for criminals to get because the total supply will decrease as they start to break down and not be replaced. It would have to be combined with policing to make sure they aren't being smuggled in from other countries though.
If you build a man a fire, he'll be warm for a day.
If you set a man on fire, he'll be warm for the rest of his life.