Interesting tidbit I came across in an unrelated article:

As the nonpartisan Congressional Research Service pointed out in a November 2012 report, “Existing data do not show whether the number of people shot and killed with semiautomatic assault weapons declined during the 10-year period (1994-2004) that those firearms were banned from further proliferation in the United States.”

But why let relevant real-world experience get in the way of a nice crusade, right?