<P> Firearms accounted for 51.5% of U.S. suicides in 2013, and suicides account for 63% of all firearm - related deaths . According to Kleck, most research has found no relationship between gun availability and suicide rates . In contrast, a 2012 review by researchers at the Harvard School of Public Health found that in the United States, the percent of suicide attempts that prove fatal is "strongly related to the availability of household firearms ." </P> <P> The number of federal and state gun laws is unknown . A 2005 American Journal of Preventive Medicine study says 300, and the NRA says 20,000, though the Washington Post fact checker says of that decades - old figure: "This 20,000 figure appears to be an ancient guesstimate that has hardened over the decades into a constantly repeated, never - questioned talking point . It could be lower, or higher, depending on who's counting what ." </P> <P> Federal gun laws are enforced by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Most federal gun laws were enacted through: </P> <Ul> <Li> National Firearms Act (1934) </Li> <Li> Omnibus Crime Control and Safe Streets Act of 1968 (1968) </Li> <Li> Gun Control Act of 1968 (1968) </Li> <Li> Firearm Owners Protection Act (1986) </Li> <Li> Undetectable Firearms Act (1988) </Li> <Li> Gun - Free School Zones Act of 1990 (1990) (ruled unconstitutional as originally written; upheld after minor edits were made by Congress) </Li> <Li> Brady Handgun Violence Prevention Act (1993) </Li> <Li> Federal Assault Weapons Ban (1994) (expired 2004) </Li> </Ul>

Which agency is most concerned with second amendment rights