Studies can appear to show any point of view, depending on where one sets the parameters for their "research".
Studies supporting my point of view are nice, those that don't are irritating. But to me, the bottom line is easily demonstrated, without any need for a study of any kind. It's so simple and so often overlooked, by everyone. I do wonder why, sometimes....
Anytime someone brings up the idea of guns being a factor in violence, avoid the studies BS, and just get to the heart of the matter.
They: More guns means more violence!
Me: So, no guns means no violence?
They: Yes! we need to ban them all!
Me: What about prisons? No guns there. Why aren't they the safest places?
They: Well..uh..because they are full of criminals!
Me: Exactly!
To paraphrase an already horribly overused quote,
"it's not the guns, stupid!"