Not if you go door-to-door and round them up and melt them down for scrap and ban the sale of ammunition as well
Sure criminals will have them for a time. But most all criminals eventually get caught (you can take away their guns at the time of arrest and then have them destroyed). The ones that don't will eventually find guns useless hunks of metal. Easily done.
You really, truly believe that, don't you?
Let's take them one at a time.
you go door-to-door and round them up
Aside from the fact that this is unconstitutional and therefore against the law, it would be impossible to do. People would have guns squirreled away in every nook, cranny, hidey hole, and hollow tree in America. You think people are just going to meekly hand over their weapons because "Uncle Sam says so"??? Surely you can't be that naive. The good people would hide their weapons and lie to the confiscators; the bad people would simply pile up bodies on their front lawns until the cops took them down.
Where? We don't have any smelting operations in America any more. You'd have to ship those guns to China.
and ban the sale of ammunition as well
See above.
Sure criminals will have them for a time.
Yeah---
all the time.
We banned whiskey once, remember? Did whiskey disappear? We've had an ongoing "war on drugs" for forty years now. Have drugs disappeared? No. So we ban guns. Will guns disappear? No. The only difference is that the criminals will have them while the good people are unarmed and defenseless.
But most all criminals eventually get caught
Some of them do, yes. A goodly number of them don't.
you can take away their guns at the time of arrest and then have them destroyed
Not even. Guns get passed around from criminal to criminal. They get hidden. They get thrown away. And you always have a few criminals who will shoot it out with you before they'll surrender their gun. Again, they're not going to just meekly hand it over to you.
The ones that don't will eventually find guns useless hunks of metal.
If you think it's because they won't be able to obtain ammunition for them, don't kid yourself. There'll be more ammo and weapons coming over the border than cocaine.
It would be interesting to see them try. Not only would it not be "easily done", it would be utterly, totally, completely impossible. Never gonna happen.