Here is a paper that tries to get something of an estimate of how much restricting gun ownership would decrease suicide. https://mason.gmu.edu/~atabarro/Briggs

Here is a paper that tries to get something of an estimate of how much restricting gun ownership would decrease suicide. https://mason.gmu.edu/~atabarro/BriggsTabarrokFirearmsSuicide.pdf https://mason.gmu.edu/~atabarro/BriggsTabarrokFirearmsSuicid... It's not perfect, of course, but probably better than a random guess.