The Actual Code Section

United States Code, Title 18, Part I, Chapter 44, Section 926A. Interstate transportation of firearms

Notwithstanding any other provision of any law or any rule or
regulation of a State or any political subdivision thereof, any
person who is not otherwise prohibited by this chapter from
transporting, shipping, or receiving a firearm shall be entitled to
transport a firearm for any lawful purpose from any place where he
may lawfully possess and carry such firearm to any other place
where he may lawfully possess and carry such firearm if, during
such transportation the firearm is unloaded, and neither the
firearm nor any ammunition being transported is readily accessible
or is directly accessible from the passenger compartment of such
transporting vehicle: Provided, That in the case of a vehicle
without a compartment separate from the driver's compartment the
firearm or ammunition shall be contained in a locked container
other than the glove compartment or console.


Layman's Translation

If you are transporting a firearm from one state to another (which places it under federal control through the often abused Interstate Commerce Clause), you are protected from anti-gun possession statutes in the states you will be passing through if you follow the requirements of the law.

These requirements are:
  1. It must be legal at the state and local level for you to possess and transport the firearm at the locality in the state where your journey originated.
  2. It must be legal at the state and local level for you to possess and transport the firearm at the locality in the state where your journey is going to end.
  3. You must be on an uninterrupted journey through any intervening anti-gun state and not be making any stop there that would make it a destination.
  4. The firearm must be unloaded
  5. The firearm & ammunition must be in a trunk OR if the vehicle has no trunk, in a LOCKED container other than the glove box or console.

Official Documents


Disclaimer

I am not an attorney and am not licensed by the Bar to practice law in any state in the United States! All information presented here is
my attempt to describe how I interpret a given legal topic and therefore, should be independently verified!