Can a state pass a gun ban? Yes, but it would considered (by most people) unconstitutional. That's what the Heller lawsuit was about.
There is no UN global gun ban. Even if the UN were silly enough to pass such a mandate, there would be no way to enforce such a ban and it would have no force of law.
no
If selling the gun is banned, then buying it before the ban is no problem. If owning the gun is banned then it does not matter when you bought it.
Depends on the laws of YOUR state- which you did not mention.
No.
There is no reason or necessity to ban firearms.
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It did not affect common people. It had an effect on soldiers that would encounter one in battle.
Impossible to answer your question without more information. Right now in the US there is a panic about possible future gun laws. No where in the US is there a total ban on guns.
Effective: February 28, 1994
It could potentially make it harder to get into the sport. It all depends on how it is implemented.