A lot of people don't even live in a country where firearms are legal, and anyway it sounds like a pretty brutal method. But I guess all those who are able to access guns at least have that method as an option. For me personally I would rather go for a peaceful poison method if I had that option. I believe that it would be easier to overcome the SI with N rather than a firearm. And as someone already mentioned, there is the risk of getting damage if something goes wrong from an attempt. I believe that there is a thread on here about a failed shotgun suicide, sounds horrific to me.