Apparently the bill's sponsors regard the "Tiahrt Amendment" as an impedement to firearms law enforcement and want it repealed. The amendment they find offensive is code that "prohibits the National Tracing Center of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) from releasing information from its firearms trace database to anyone other than a law enforcement agency or prosecutor in connection with a criminal investigation. This precludes gun trace data from being used in academic research of gun use in crime. Additionally, the law blocks any data legally released from being admissible in civil lawsuits against gun sellers or manufacturers." (quoted from Wikipedia) I dunno, but that sounds like a pretty good idea to me, and I don't really see how enforcement of existing firearms law is being impeded. Maybe the sponsors are rather thinking of new firearms law they want to see enacted? H.R.5917 is the mirror House bill, although it has a different title and makes additional changes to existing laws.