So you don't know, and you lied and said you did. Point noted for future debates with you - you're open to lying if it suits you.
The point is not whether guns that are illegally owned are just as fatal as legally owned guns. We all know they are.
The point is that if the guns are illegally owned, then you still have no idea how to solve the problem, as a gun ban of any sorts would not capture weapons illegally acquired. This means you just rant and shout at the rain, without any solution. If that's all you want to do, simply state it and we can settle this issue once and for all.
Otherwise, please offer how you would get rid of illegally owned firearms.