A gun is a gun regardless of what it looks like, so you would need to fill out the same paperwork as any other handgun. Also, because it does not look like a gun, it would always be concealed, even if you can see it. For some reason I can't seem to find the definition of "concealed handgun", so no citations. From memory is is "concealed from view, or disguising it's true nature". The part in bold basically says if it doesn't look like a firearm, it is a concealed weapon.
Disclaimer: I am not a lawyer, but I am fairly certain this is all true.