I don't care to get into specific details. I'm not well versed in them. The point is that some guns are made specifically to fire lots of bullets, very fast. By contrast, I own several guns. (I don't use them. I just own them.)
Most of them can fire a bullet, or a shotgun shell, and then you have to work some sort of action to fire a second one, if it's even possible without reloading, and none of them can fire very many. I also own a revolver. If it's fully loaded, I can fire six shots, by pulling the trigger six times. Then, I would have to reload. It's also not very accurate, so the target has to be at close range.
Those characteristics of a revolver make it easy to use as a murder weapon, but also very good as a weapon of self defense. What would I need for self defense? In most scenarios, I need to scare someone away. It's perfect for that. I might have to fire a few shots quickly at an attacker. It's pretty good for that.
If I had an AK-47, I could fire a whole lot of shots before having to take time to reload. I could also fire farther and more accurately. What scenario do I need to be able to do that? If I'm hunting, I don't need to fire lots of shots. In self defense, I don't need to fire long range, and I don't need to fire all that many shots. I could come up with some sort of scenario where I did need to fire lots of shots, but it would be a bizarre fantasy that involved holding out against gangs or someone determined to kill me, and similarly armed. That's never going to happen. I don't need that weapon.
The only people who do need that weapon are people who want to hit a whole lot of moving targets, very quickly, or someone who has to provide suppressing fire during a sustained shootout. I can't think of any good reason that I would want to enable a civilian to perform well in either of those scenarios.
So, I won't be getting into details about exactly which weapons should be banned for future sale. I'll leave that to legislators' staffs. I'll just stick with my earlier comment that I want to ban weapons that can fire lots of bullets real fast. Someone else can define "lots" and "real fast".