This story is unavailable.

2000 guns cross the border from Mexico into the United States every day. If the conversation is about gun control, would not -for example- some kind of wall along that border assist with reducing the flow of guns?

Actually, those 2000 guns cross the border from the United States into Mexico, as documented by the link you provide. Those American guns are legally bought in the United States through straw man purchases and trafficked into Mexico into the hands of the cartels. I agree some kind of wall along the border would assist with reducing the flow of guns…into Mexico.