What does FactCheck.org have to say about it? Oh, here it is....
Q: Does the Obama administration intend to “force gun control and a complete ban on all weapons for U.S. citizens” through a United Nations treaty?
A: No. The administration plans to negotiate a treaty to regulate the international export and import of weapons.
It says that it won’t support any treaty that regulates the domestic transfer or ownership of weapons, or that infringes on the Second Amendment.