I'm no expert on the matter but it's my understanding that Vermont...yes,VERMONT...has just about the most lenient gun laws in the nation.It's also my understanding that they have one of the lowest violent crime rates in the country.
Of course those of us familiar with the state know that there's another noteworthy fact about Vermont that might help explain its low crime rate.
Wyoming Crime Rates Among The Lowest In The Country
Wyoming has 60% gun ownership, and their crime rate is among the lowest in the US
https://stevengoddard.wordpress.com/2013/01/08/wyoming-crime-rates-among-the-lowest-in-the-country/
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Vermont: Safe, Happy and Armed to the Teeth:
http://www.nationalreview.com/corner/381136/vermont-safe-and-happy-and-armed-teeth-charles-c-w-cooke