"The December 2012 Newtown, CT, tragedy, along with other mass shootings in Aurora, CO, and Tucson, AZ, restarted the national gun control debate in the 113th Congress. The Senate considered a range of legislative proposals, including several that President Barack Obama supported as part of his national gun violence reduction plan. The most salient of these proposals would have (1) required background checks for intrastate firearms transfers between unlicensed persons at gun shows and nearly any other venue, otherwise known as the 'universal background checks' proposal; (2) increased penalties for gun trafficking; and (3) reinstated and strengthened an expired federal ban on detachable ammunition magazines of over 10-round capacity and certain 'military style' firearms commonly described as 'semiautomatic assault weapons,' which are designed to accept such magazines. […] The House passed and the Senate considered bills (H.R. 3590 and S. 2363) intended to promote hunting, fishing, and recreational shooting in February and July 2014, respectively. Both bills arguably included several gun control-related provisions. The House Committee on Appropriations approved an FY2015 Interior appropriations measure (H.R. 4923) on July 9, 2014, that included provisions which were similar, but not identical, to those included in H.R. 3590 and S. 2363. The House passed an FY2015 Energy and Water Development Appropriations bill (H.R. 4923) on July 10, 2014, that included a provision that would have addressed civilian carry of firearms on public properties managed by the Army Corps of Engineers. In addition, the House amended and passed an FY2015 District of Columbia appropriations bill (H.R. 5016) on July 16, 2014, with a provision that would have prohibited the use of any funding provided under that bill from being used to enforce certain District gun control statutes."
CRS Report for Congress, R42987