What do you think of Felipe Calderon's suggestion that the Assault Weapons Ban be imposed again?

According to Mexican President Calderon, 80 percent of all firearms seized in Mexico come from the United States. With that in mind, he invited President Obama, while not bluntly opposing or suggesting that the 2nd Amendment be rewritten all-together, that the U.S. take the first step in restricting its U.S. citizens from 'the right to keep and bear arms' as much as possible and in return help Mexico in keeping its Mexican citizens away from guns as much as possible. Traditionally, Mexican citizens are only entitled to a few low profile calibers under the principle that while every citizen has the right to self-defense, he or she only requires a small arm of small ammunition to do so and therefore any firearm or ammunition outside that clause is strictly forbidden to citizens and exclusive to members of the armed forces and law enforcement agencies. Out of context, Calderon pretty much suggested that while Mexico has shown to be ineffective in preventing the illegal flow of arms into the country, the United States can start helping by limiting the right and access of weapons to its own citizens. Would this be right approach?