I'm originally from Mass, and up there they have a mandatory 1 year in jail for an illegal/unregistered gun...any type of gun!!
You should check ths website for Guide to Interstate Transport of Guns...
FEDERAL LAW ON TRANSPORTATION OF FIREARMS
A provision of federal law serves as a defense to state or local laws which would prohibit the passage of persons with firearms in interstate travel.
Notwithstanding any state or local law, a person shall be entitled to transport a firearm from any place where he may lawfully possess it to any other place where he may lawfully possess such firearm if the firearm is unloaded and in the trunk. In vehicles without a trunk, the unloaded firearm shall be in a locked container other than the glove compartment or console. Necessary stops, like gasoline and rest, seem permissible.
TRANSPORTATION BY MOTOR VEHICLE
In most states, personally-owned firearms may be transported legally if they are unloaded, cased, and locked in the automobile trunk.
The exceptions to this rule apply mainly to interstate transportation of handguns. The myriad and conflicting legal requirements for firearm transportation through the states make caution the key for travelers.
If you travel with a trailer or camper that is hauled by an automobile, it is advisable to transport the firearms unloaded, cased and locked in the automobile trunk. If your vehicle is of the type in which driving and living spaces are not separated, the problem becomes one of access. If the firearm (handgun, rifle or shotgun) is carried on or about the person, or placed in the camper where it is readily accessible to the driver or any passenger, state and local laws regarding concealed carrying of firearms may apply. It is recommended, therefore, that the firearm be transported unloaded, cased, and placed in a locked rear compartment of the camper or mobile home, inaccessible to the driver or passenger.
Generally, a mobile home is considered a home if it is not attached to a towing vehicle, is permanently attached to utilities or placed on blocks or in such a manner that it cannot immediately be started up and used as a vehicle.
Once you reach your destination, state, and/or municipal law will control the ownership, possession, and transportation of your firearms.
NATIONAL AND STATE PARKS
Generally, firearms are prohibited in national parks. If you are transporting firearms, you must notify the ranger or gate attendant on your arrival, and your firearm must be rendered inoperable before you enter the park. The National Park Service defines inoperable to mean unloaded, cased, broken down if possible, and out of sight. Individuals in possession of an operable firearm in a national park are subject to arrest. Rules in various state park systems vary, so always inquire first.
National Forests usually follow laws of the state where the forest is located.