I know you put a lot of work into this. Here are my concerns:
1. The overwhelming majority of countries that permit personal gun ownership have onerous laws for the purchase, transfer, possession, and registration of firearms. I really enjoy the convenience of not having to navigate a mile of red tape every time I want to purchase, sell, or transfer of guns and ammunition. A comprehensive set of gun reforms seems good in theory, but my concern is we'd just end up like every other over-regulated country.
2. Reading actual proposals put forth by gun control advocates, there are a lot of changes being promoted that consist of 99% punishment of law-abiding gun owners, and 1% making a dent in gun violence. It's perpetually annoying, as a responsible gun owner, to be continuously facing attacks that impede my ability to own and use firearms. Personally, I don't even really like guns...but they are great hunting and personal defense tools. If/when the major voices in the gun control lobby refocus their attention to targeting gun violence that is not at the overwhelming expense of law-abiding gun owners, I'd be much more interested in trying to compromise on finding solutions.
3. Guns are tools. If we got rid of every gun in America tomorrow ALL the social rot remains. Socially disaffected persons will continue to turn to mass violence towards others, and they will use different tools. Drive trucks into crowds, poisons, explosives, whatever. Would there be less violence in our country? I doubt it. I anticipate we would see a dip in the lethality of violence, but perhaps less than we'd hope for.
4. More government is not always better. There are a plethora of, usually well-intentioned, federal and state laws, policies, practices, programs, etc. that fuel, perpetuate, feed, and magnify social ills, such as inequality, voting disenfranchisement, employment barriers, housing discrimination, wealth disparity, healthcare access, etc. Our tax dollars at work to perpetuate social rot. Just one example, look at the millions of our own citizens that we incarcerate, higher than any other nation in the world. Step 1 in reducing gun violence is gut our governments of all the counterproductive nonsense they do.
5. We are in dire need of mental health advocacy in our country. It's time to start calling out all the politicians on the right for blaming the "mentally ill" for all gun violence. These claims are intentionally false. A bogeyman that distracts from many of the core issues contributing to gun violence. We do need better mental health care in our country, for the sake of persons who need that treatment. If reduced gun violence is a added bonus of that, great.
Rant: There's a lot of have-not's in America. We make it really difficult for people to participate in our society in a pro-social manner. We structure our laws to destroy families, keep people poor, keep people from working good jobs, keep kids from being raised by their parents, keep people from living, working, learning in a safe and healthy places, and disenfranchise people at the ballot box. If we look towards a bigger government as the fix to these issues, we get exactly what we deserve - inefficient, corrupt, cancerous, money-pit.