It's not even
remotely the same thing. First, let's stop calling them "machine guns" as the phrase is so amateurish and inaccurate. Let's refer to them as automatic weapons. Automatic weapons were first regulated in 1934 during the
National Firearms Act legislation. This strictly regulated the manufacture, possession and transfer of automatic weapons. Prior to 1934, possession of such automatic weapons was almost unheard of, for the simple fact that they were immensely expensive. The 1968 Gun Control Act further restricted and required registration of such weapons, but again, almost no one actually owned them. It would be like buying a $800 hammer when you can buy one for $8 that does the job. No one needed them, no one wanted them. They were very, very few in circulation anywhere. Then, in 1986, Firearm Owner's Protection Act outright banned them without ATF registration and very comprehensive background checks that are both expensive and time consuming. The reason this ban actually worked is because no one really had them before, no one could get them now, and again, why go through all the trouble when it was so easy to get a regular semi-automatic gun. Unless you are planning to go to war or something against the government, there's no point in getting a machine gun. At all.
Putting a ban in place on semi-automatic guns is a completely different monster. There are over 300
million firearms currently in circulation. There is no national database of who owns them. Trying to buy them back would meet with no success - as previous buyback programs in places like New York State, for example, resulted in minuscule amounts of people (4% according to the State of New York) actually taking the buyback. So if people don't do it voluntarily, you have to seize them. How can you seize them when there is no way to know who has them and who does not? You'd have to go house to house to arrest everyone, and you can imagine how that would go over.
I get that the facts in this particular topic are not convenient. I understand how they may make the problem complicated and not paint the picture that you folks who want to seize guns are looking for. What I'm trying to explain to you is regardless of where you stand on this issue, the
facts don't change.