This is what happens when a city passes laws that the surrounding areas do not. Within the city of Chicago, you can't buy guns but across the street (in some cases), guns are readily available.
Problem is, even if every city passes gun laws, there will still be areas where the gun nutters want to arm drug dealers, known terrorists, illegals, the mentally ill and violent criminals.
And, if they don't buy from surrounding suburbs, there's always the internet or the scum bag gun nutter down the block.
Idiot gun nutters reaping what they sow and enjoying the thousands of gun deaths they're causing. Like, the fact that the number killed since your big success at Newtown is almost the same as during the illegal war against other innocent people in Iraq.