One more thing that bothers me here about your basic premise, and this study is this:

Seven of the top ten source dealers are within Illinois, and six of those seven fall within the Cook County suburbs that border Chicago. The remaining FFL source dealers within the top ten are located in northwest Indiana. Collectively, these ten source dealers make up almost a quarter of the crime guns recovered in Chicago, despite the existence of many other federally licensed dealers in Chicago’s vicinity.

So, what was the source of the OTHER 75% of the guns? Thats a pretty big proportion of the guns for you to make this the critical problem with your bullshit solutions.