The National Firearms Act (NFA)

The NFA regulates the manufacture, transfer, and possession of certain firearms and accessories, including machine guns, short-barreled rifles, short-barreled shotguns, silencers/suppressors, and items defined by the ATF as ï¿½Any Other Weaponsï¿½ or AOW.
For more information, see the links below.

Wikipedia page on
the NFA: http://en.wikipedia.org/wiki/
National_Firearms_Act

ATF's description
of the NFA: https://www.atf.gov/content/firearms/
firearms-industry/national-firearms-act

Actual NFA Text: http://www.gpo.gov/fdsys/pkg/USCODE-2011-title26/pdf/USCODE-2011-title26-subtitleE-chap53.pdf

How NFA weapons differ from so-called
"Assault Weapons":
http://www.assaultweapontruth.com

Some good information
about fully
Automatic Firearms
(machineguns)
http://guncite.com/gun_control_gcfullau.html