I would be curious how the so called expert produced evidence UBCs had an impact and how (and how much) compliance was achieved without a registration system. The skeptic in me figure if true, every anti gun rag would have broadcast the evidence every chance available. As for claims the assault weapon ban had any impact on mass shootings, that fact would have been noted in the 2013 CDC study and it wasn’t. As usual, it’s not likely votes will be cast on the weight of evidence, but on the basis of political considerations. As for the bills, you can post links, but I suspect the NRA-ILA will be posting updates on their site as well.