Which of the following firearms is illegal to possess in Hawaii without a special permit?

In Hawaii, the possession of automatic firearms is prohibited without a special permit. This is because automatic firearms, also known as machine guns, have the capability of firing multiple rounds of ammunition with a single pull of the trigger. They are considered more dangerous and can cause significant harm if not handled properly. Therefore, the possession of automatic firearms without proper authorization is illegal. The other options, such as handguns, rifles, and shotguns, are legal to possess in Hawaii with certain requirements and permits. However, automatic firearms are the only option listed that require a special permit for possession in Hawaii.