Impossible to answer without knowing what you mean by illegal handguns.
There is no requirement for registration of handguns to an owner in 98% of the US. Despite what you may see in the movies.
Since most states don't require registration, and there is no federal law requiring registration, most of the handguns in the U.S. are unregistered. "Unregistered" is a misleading term. It implies that a person has failed to do something that is required.
No
No.
All firearms owners or users in New Zealand are required to be registered - these records being held by the Police. As for handguns, I understand that these are allowed to registered members of a registered handguns club, but there are strict regulations regarding where and how they may be stored.
Regular handguns have never been required to be registered by federal law. A few states have registration, but it's a local state law.
Yes. The answer is, it depends on where you are. In the United States, in most states, shotguns do not have to be registered, and for that matter, handguns, contrary to extremely popular, but patently incorrect belief, neither do handguns.
PA doesn't require registration ofordinary Title I firearms, to include handguns.
It depends on where you are. In most U.S. states, they do not have to be.
Rifles and shotguns, yes. Handguns, no, you must be 21 to legally purchase a handgun.
That is a very difficult question to answer for a couple of reason. Only a few states require handgun registration, and there is no federal gun registration. In the few states that do require handgun registration, the information is not generally available to the public.
Laws vary from state to state. In MOST states, there is no "registration" of firearms as such. If you live in a state that DOES require registration, then yes, that would be illegal.
Wisconsin does not require registration of handguns. Information for you: http://crime.about.com/od/gunlawsbystate/a/gunlaws_wi.htm MOST states do not require registration of firearms.