No. Many states have "safe storage" laws, but there is no Federal law on this subject.
Your question is an incorrect statement. Why do you think states must not enforce gun laws? They do.
States have their own laws. Federal laws are under the purview of the BATFE
Like most states, there are far too many gun laws for a brief answer here on Answers.com. However, this is a link to a review of several of their gun laws. https://en.wikipedia.org/wiki/Gun_laws_in_Louisiana
There are thousands of laws that relate to gun control, and cover every state. Those laws have been there for years.
The first layer is federal gun laws. From there State laws can restrict gun laws more, but not make them more liberal. From there County laws/ordinances can restrict more so, but not make them more liberal. <><><> Above is correct, but with an exception- Many states have enacted "preemption" statutes, to prevent a "patchwork quilt" of gun laws that vary dramatically city to city, county to county. In those states, the State Legislature preempts the ability of a county to pass gun laws, reserving that right to itself.
No. While it is a wise practice to secure firearms, minors- with the permission of their parents- may possess and use firearms in Missouri. The state laws encourage safe storage, but it is not mandated.
Not really possible to answer your question as written. Alaska, Arizona and Utah have very few gun laws in comparison to other states.
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Research shows that it will reduce gun deaths. States and countries who have passed gun laws have fewer deaths.
The RAC system must be good. Many police departments use them to keep their officers and firearms safe, protected and away from the hands of criminals and children.
In most U.S. states, you go to a gun store and purchase one, or purchase one from an individual. Check you local laws.