As always, there is a considerable amount of handwringing on a post like this.
However, there are a couple of things to keep in mind:
1) I could be wrong, but I doubt that we will see a full "turn them in" ban. Probably closer, if it comes to pass, like the '94 "ban" except probably without a sunset clause. Even that would surprise me right now due to the (without getting political) number of Senators from the South and West, regardless of party, who know that voting for this would be the kiss of death for their careers. (I have written the House off, at this point, as a waste of space.)
2) Even if the worst happens, there aren't enough LEO's (assuming they are willing to violate their oaths) to kick down all the doors and seize all the weapons. There are millions of us. If the "war on drugs" is an absolute failure, think about what a law enforcement nightmare depriving Americans of their rights would be.
3) Even if it comes to that, there aren't enough jail cells to contain us. Once again we have the strength of numbers.
As a result, enjoy your freedom, maintain vigilance, and keep your powder dry.