And what if an attacker shows up during that time? "Excuse me Mr. Rapist--would you mind coming back in a couple days when I have my gun?"
Also, please explain why people who are so dangerous they must be prevented from buying guns are not so dangerous that they belong in prison, and why the freedom of such people should be put ahead of the freedom of the law-abiding.
I wasn't defending it, just explaining the current state of that law.