It's a hard experiment to pull off. First - because being surrounded by states where access to guns is easier will mean it's likely that they'll be significant

It's a hard experiment to pull off. First - because being surrounded by states where access to guns is easier will mean it's likely that they'll be significant illegal traffic in guns. You already see that between areas with tight gun controls like NYC and other states. Second because I think one or two years is unlikely to be enough time for affects to show. I'd bet you'd see a drop in male suicide - but the culture of crime and violence will take longer to change.