The criminal element largely responsible for gun crime would criminally ignore the ban. They're already shooting people.
The US shares a 3,145 kilometer long border with Mexico, unfortunately there are at best 1,044 km of border 'barriers' in place. People, guns, money and drugs are smuggled across the border daily.
Guns aren't smuggled in from the Southern border. If anything guns are smuggled out of the USA into mexico, how do you think the cartels get their guns?
The US shares a 3,145 kilometer long border with Mexico, unfortunately there are at best 1,044 km of border 'barriers' in place. People, guns, money and drugs are smuggled across the border daily.