So, let's assume for a moment that we live in some sort of fantasy world where any of this is even remotely possible. What exactly would it take to "ban and confiscate all guns"?
First, let's talk about the United States, which has that pesky Constitution to deal with. It is possible, technically, to repeal any Amendment to the Constitution, including the 2nd, by passing another one. Consider the 18th and 21st Amendments. How exactly is the Constitution amended? The first step is to actually propose an Amendment, which can be done in one of two ways (arguably three, but only two are explicitly specified in the Constitution itself, so I'll stick to those). The first way is for a bill to pass both the Senate and House of Representatives with a two thirds majority in each. The second method is for a Constitutional Convention, called by two thirds of the legislatures of the States, to propose the Amendment. Note: neither method actually enacts an amendment, they merely propose them.
Irrespective of which method generates the Amendment, it then goes to the States to be ratified. Three fourths of the States must ratify it. In today's U.S., that's 38 states. It's possible, though not probable, that enough arm-twisting on Capitol Hill could get 67 Senators and 290 Representatives to all agree on the text of an Amendment, but getting it past 38 States is unlikely at best. Only 13 States have to vote no, or even more simply, decline to vote at all. Population and size don't count either; each state gets one vote. Take a look at a map sometime and tell me you can't find 13 State that would tell the Feds to fuck off with regard to such an Amendment.
But...repealing the 2nd alone isn't sufficient, since it's not the 2nd that actually grants the right to keep and bear arms. Look at the wording if you don't believe me. That little fact is true of all the amendments, by the way. They don't grant rights, they simply explicitly tell the government to not violate them. And, since the Constitution itself states that any powers not granted to the government are reserved to the States and the People, get ready to pass another amendment that actually allows the government to violate your Creator given rights. Using the same process as the other one. Good luck with that.
Now, having somehow convinced most of the law-abiding citizens in the U.S. to support giving up their right to keep and bear arms, what to do about all the people who don't give a shit about the law? You know, the ones who, like some on this site who keep poking their dicks into the mouths and pussies of those numerous ladies of negotiable virtue despite prostitution laws, will keep their guns no matter what the law decides they must do.
I guess that's where the "confiscate and destroy" part comes in, huh? Well, what would it take to do that? First, lots of money to employ the people to do it. Lots of money. Like army funding money. At least some of the folks who have guns will violently resist giving them up, so it seems likely that the people tasked with the actual confiscation will need to be able to force their way into some people's houses in the face of gunfire. So don't forget guns, though it might be possible to arm some of the confiscators with the fruits of their labors. That will save some money too, but probably not much. Oh wait, there's another one of those damned Constitutional issues again. We simply can't legally force our way into people's houses without the appropriate authority. So prepare to either convince/bribe a bunch of judges that probable cause exists, or start working up your Constitutional amendment process again to get that pesky 4th repealed (and another to actually permit violating another right).
I also hope you've vetted all the people who will actually be doing the confiscating and destroying, so that they don't, you know, maybe "forget" to turn some of them over to to the destroyers, or the destroyers themselves don't see a money making opportunity to sell some of them back again. Otherwise, you're going to have more work to do, getting those back and destroyed.
Of course, after doing all this, the gun manufacturers will be simply delighted to stop manufacturing guns and destroy all the equipment they use to do so. Remember how all the alcohol companies stopped brewing and distilling alcohol during Prohibition? It should be about that easy, so no worries there.
Now, after somehow mangling the Constitution to turn the U.S. into a totalitarian state, what to do about the rest of the world, since it seems likely to me that if there are any guns being manufactured anywhere, there are still all those ungrateful wretches who still want one, and will go to whatever lengths necessary to get one, irrespective of what the law allows. Kinda like what happens now, don't you think? Or will people magically alter their beliefs in light of the absence of guns.
After the U.S., you're going to have to go after the rest of the planet, otherwise those countries will be sources of guns. That won't be too difficult, as most of the rest of the world has already solved this problem by successfully banning guns, and no longer has anything to worry about. Of course, this also means that governments will have to give up their guns as well, since any source of guns will also be a source for illegal guns in the hands of criminals. Good luck getting China, Russia and such to let go of all the guns their armies have. I'm sure they'll listen to reason, though.
Good luck with all that. Just remember that, even in your fantasy world where all this is possible, when you come for my gun, one or both of us is gonna die, and there's no guarantee that it will be me.
Fuck off.
Are you giving Alucard equal time? :)