Don't smoke the flowers..... BUT.....

You can legally own a Machine Gun

It is a common mihttp://www.usautoweapons.com/sconception that machine guns cannot be owned by law-abiding citizens. This comes from the creation of a variety of confusing laws that have made purchasing a fully automatic gun more difficult than purchasing a "normal" gun. But, you can comply with the law and own a machine gun. In May of 1986, new laws went into effect that made it illegal for civilians to own fully automatic firearms that were manufactured AFTER THAT DATE. Most fully automatic weapons manufactured and registered BEFORE MAY, 1986, may be owned by and sold to individuals. The full-auto guns that may be owned by individuals are called "transferable". A few states do not allow machine gun ownership at all, no matter when the gun was made, but most states do allow it when complying with federal requirements.   

mahttp://www.usautoweapons.com/chine gun

of course it is easier to buy guns in some places Like AZ 

Arizona

Subject/Law	Long guns	Handguns	Relevant Statutes	Notes
State Permit to Purchase?	No	No	None	no
Firearm registration?	Partial	Partial	ARS 13-3101	State law duplicates the registration requirements of the National Firearms Act.
"Assault weapon" law?	No	No	None	No
Owner license required?	No	No	None	No