Here's a hint, it isn't American gun stores or American gun shows. As the article states:
"Mexico has a gun problem, just like they have a drug problem and both the U.S. and Mexican governments are trying to place the blame on U.S. gun owners. U.S. gun owners aren't the problem. Mexico is the problem. The government is corrupt from the lowest level law enforcement officer shaking down American tourists for traffic violations, to officials and politicians highly placed within the Mexican government, including elements within the military. Everyone knows it. Everyone in Mexico knows it. Every law enforcement official in the U.S. knows it, and everyone in our government knows it. And anyone who has worked for any length of time within border cities and lived in the local community knows it. This is taking a Mexican problem, blaming the U.S. by turning it into a crisis in order further an agenda, and Eric Holder and President Obama knows it and they are taking advantage of it."Of course they are. As Rahm Emanuel, Obama's chief of staff, said, "You never want a serious crisis to go to waste."
There are some guns being smuggled into Mexico from the U.S., but they're typically bought by wealthier Mexican citizens for personal and home defense. With the mess they have down there, I can understand why.