As pointed out, guns are a means to suicide, not the cause. While I do believe in gun control, until we have physician assisted suicide, guns are some of the most reliable ways for people to have a say in when their life ends.

Take away the guns(the this specific circumstance, not talking about other gun related issues) and the suicide rate will maybe go down, but the rate of unsuccessful, excruciating, and possibly disfiguring/disabling suicide attempts will absolutely go up.