Question special

Dr. Kalesan's Lancet paper -- freely available in the Resources tab above, and here: -- looked at the state-level regulatory legislation associated with the lowest rates of firearm-related mortality. She identified three, and then calculated what effect they might have if implemented nationally.
Dr. Hemenway was invited by The Lancet to comment on the piece, and he was skeptical that it would work.
But at least we had a proposed intervention, however imperfect, and a response to it. That's not a bad path to follow. After all, it's how other public health problems have been addressed -- polio and HIV, for example.
I'd like to invite Kalesan and Hemenway to expand a bit on their ideas and to give the rest of us a peek at other avenues that have occurred to them since their formal encounter in The Lancet's pages.