Second Amendment Protection Act of 2013 - Expresses the sense of Congress that the United States should not adopt any treaty that poses a threat to national sovereignty or abridges the rights guaranteed by the Constitution, such as the right to bear arms, and should cease the provision of financial support to any entity that does so.
Prohibits the United States from providing any funding to the United Nations (U.N.) for a fiscal year unless the President certifies to Congress that the U.N. has not taken action to infringe on the rights of individuals in the United States to possess a firearm or ammunition, or abridge any of the other constitutionally protected rights of U.S. citizens.