So getting back to your original point, this won't happen where weapons are allowed? Or is it more like an inverse relationship with gun freedom?
It's an inverse relationship, as
John Lott points out.
Interesting, thanks. Could you post a link for me? I'm at work, not being lazy. Well, not really

If you'll notice, I already did. Click on Sv. Lott's name. It leads to the Google Books version of the book, which, as near as I can tell, is the entire third edition.
Cheers. I'm a dope and didn't notice.
So how does this stop black market arms dealers from selling weapons in a way of which the local community would disapprove?
Care to explain to me, first, exactly what "black market" means in a society where there are no laws limiting what one can buy or sell?
Any arms dealer who sells weapons in a way of which the local community would disapprove.
They don't buy from him, or - and this is important - sell to him.
There will always be criminals in a community. A successful criminal may remain hidden. While the majority of the community may shun the vendor - if they know he or she exists - that won't stop criminals. Also, if the dealer is not located locally, not selling to them won't matter.