From Bearing Arms:

You can travel from wherever you live in the United States to wherever you want in the United States, and your freedom of speech still exists, along with your right to peaceably assemble, petition the government, be secure in your person and property, or have a jury trial if you’re arrested. You take your rights with you no matter where you go, with one very big exception. Your Second Amendment rights typically end at the state line where you live. Cross that border, and your right becomes a privilege, or maybe even a crime.