U.S. Sen. Bill Nelson introduced legislation this week that would create a national gun registry. Known as the “Crime Gun Tracing Modernization Act,” the bill would require ATF to set up a “searchable, computerized database” of all records pertaining to the sale, importation, production or shipment of firearms. The agency would be given three years to get the system up and running. “The fact that there is a law on the books that forces agents to comb through millions of files by hand is absolutely ridiculous,” said Nelson, a Florida Democrat.