[sheepmullet]

> so they are not going to have the same demand Mexico does

The US has a higher demand for firearms than Mexico does - it's just local manufacturing more than meets the local demand.

> it is a stretch to think Mexican cartels can run guns as effectively in the US as they do in Mexico.

They do just fine running drugs and people. I don't see why guns would be any harder.

> If your solution is a wall at the border you have completely lost me.

Gun bans at the city and state level have been found utterly ineffective at reducing violence - in large part because people run guns over the state/city border.

Why would you expect a nationwide ban to be any more effective?

It would still be easy to run guns over the border - just the border now is a national border instead of a state/city border.