They can't get an AWB through the Senate. Do you really think they can get 2/3 of the Senate to ratify a treaty that bans all private firearms ownership?
The UN isn't coming for your guns. There are enough real problems without spending time worrying about this.
I heard or read somewhere that once a tretaty is signed by the president it basically becomes the law of the land until such time as it comes up for ratification vote in the senate. So, all they would need to do is keep postponing such a vote and we would be stuck with it.
I'm cannot cite a source as a do not recall where I heard it. Also, I am not presenting this as fact as I can't research it at the moment. So, if anyone more educated on the topic can confirm this as true or confirm that it is B.S. that would be much appreciated.