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.
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.
Impossible to answer without knowing what you mean by illegal handguns.
Rifles and shotguns, yes. Handguns, no, you must be 21 to legally purchase a handgun.
No
yes unregistered hypercam is free it just has unregistered at the top left corner
Possessing a stone is not illegal.
yes it is
no its illegal
No
No its not illegal to have it parked out of motion but if you were to be driving then yes it is
PA doesn't require registration ofordinary Title I firearms, to include handguns.
ALL OF THEM. Handguns are illegal.