According to El Universal ...

Snippet from     Monday, October 1, 2012.

"In Mexico no stores sale weapons, owning a weapon is illegal unless you can get a permit  that proves that your life depends on being armed  or that your job requires it ...

"In spite of all that, [Mexico] ranks seventh in the world for the most firearms in the hands of civilians: 15 million, one for every three adults, according to the United Nations..."