The Senate has become a hyper-partisan vehicle of gridlock over the past decade, really forcing one to contemplate and re-examine why the need for such a chamber in the first place? Each State gets two Senators regardless as to the number of constituents? Well, at least D.C. doesn't get any, despite getting 3 votes in the electoral college.
Fact of the matter remains, Fienstein can sit there and look stupid by trying to define what an assault weapon actually is, but for the next two years at least the House is controlled by the GOP and there will be no legislation on firearms. And even if the Senate were to take up a UN firearms treaty, I don't see how they would get 66 votes with only 55 Democrats.