; (10) since 2016, the country has witnessed 4 of the 10 worst gun massacres in modern United States history; and (11) in February 2018, 17 members of the Marjory Stoneman Douglas High School community in Parkland, Florida, lost their lives at the hands of a 19-year-old armed with an AR–15 semiautomatic assault rifle. (b) Sense of Congress It is the sense of Congress that— (1) firearms trafficking is prevalent and widespread in and among the States, and it is usually impossible to distinguish between intrastate trafficking and interstate trafficking; and (2) it is in the national interest and within the role of the Federal Government to ensure that the regulation of firearms is uniform among the States, that law enforcement can quickly and effectively trace firearms used in crime, and that firearms owners know how to use and safely store their firearms. (c) Purposes The purposes of this Act and the amendments made by this Act are— (1) to protect the public against the unreasonable risk of injury and negligent or reckless death associated with the unrecorded sale or transfer of qualifying firearms to criminals and youths; (2) to ensure that owners of qualifying firearms are knowledgeable in the safe use, handling, and storage of those firearms; (3) to restrict the availability of qualifying firearms to criminals, youth, and other persons prohibited by Federal law from receiving firearms; (4) to facilitate the tracing of qualifying firearms used in crime by Federal and State law enforcement agencies