More Guns, Less Crime: Understanding Crime and Gun Control Laws (Studies in Law and Economics) cover
More Guns, Less Crime: Understanding Crime and Gun Control Laws (Studies in Law and Economics)
by John R. Lott (Jr.)
ISBN: 0226493636
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yummyfajitas · 2010-12-13 · Original thread
At least one study purports to do exactly this.

http://www.amazon.com/More-Guns-Less-Crime-Understanding/dp/...

(I haven't read it myself, so I'm not endorsing it. It's not exactly uncontroversial.)