Fully automatic, selective fire assault rifle:
http://en.wikipedia.org/wiki/AK-47
Missouri gun laws:
Am I able to purchase a rifle or handgun? - After August 28, 2007 a person must only be approved through NICS for purchase of a firearm. The federally prohibitive criteria outlining the reasons an individual may be precluded from the transfer/possession of a firearm or firearm-related permit, pursuant to Title 18 U.S.C., §§ 922 (g) and (n), are as follows:
* A person convicted in any court of a crime punishable by imprisonment for a term exceeding one year, whether or not sentence is imposed. This includes misdemeanor offenses with a potential term of imprisonment in excess of two years, whether or not sentence was imposed.
* Persons who are fugitives of justice; for example, the subject of an active felony or misdemeanor warrant.
* An unlawful user and/or an addict of any controlled substance; for example, a person convicted for the use or possession of a controlled substance within the past year, or a person with multiple arrests for the use or possession of a controlled substance within the past five years with the most recent arrest occurring within the past year, or a person found through a drug test to use a controlled substance unlawfully, provided the test was administered within the past year.
* A person adjudicated mental defective or involuntarily committed to a mental institution or incompetent to handle own affairs, including dispositions to criminal charges pertaining to found not guilty by reason of insanity or found incompetent to stand trial.
* An alien illegally/unlawfully in the United States or a non-immigrant who does not qualify for the exceptions under Title 18 U.S.C. Section 922(y); for example, not have possession of a valid hunting license.
* A person dishonorably discharged from the United States Armed Forces.
* A person who has renounced his/her United States citizenship.
* The subject of a protective order issued after a hearing in which the respondent had notice that restrains them from harassing, stalking, or threatening an intimate partner or child of such partner. This does not include ex parte orders.
* A person convicted in any court of a misdemeanor crime which includes the use or attempted use of physical force or threatened use of a deadly weapon and the defendant was the spouse, former spouse, parent, guardian of the victim, by a person with whom the victim shares a child in common, by a person who is cohabiting with or has cohabited in the past with the victim as a spouse, parent, guardian or similarly situated to a spouse, parent or guardian of the victim.
* A person under indictment or information for a crime punishable by imprisonment for a term exceeding one year
Federal permit to own a fully automatic weapon:
Can I purchase a fully automatic rifle or pistol? - Possibly. First, a potential buyer must have a C&R FFL License. A C&R does not automatically grant you the right to acquire an automatic weapon. They are not illegal in Missouri but a specific procedure must be followed.
It has been unlawful since 1934 (The National Firearms Act) for civilians to own machine guns without special permission from the U.S. Treasury Department. Machine guns are subject to a $200 tax every time their ownership changes from one federally registered owner to another, and each new weapon is subject to a manufacturing tax when it is made, and it must be registered with the Bureau of Alcohol Tobacco and Firearms (BATFE) in its National Firearms Registry.
To become a registered owner, a complete FBI background investigation is conducted, checking for any criminal history or tendencies toward violence, and an application must be submitted to the BATFE including two sets of fingerprints, a recent photo, a sworn affidavit that transfer of the NFA firearm is of "reasonable necessity," and that sale to and possession of the weapon by the applicant "would be consistent with public safety." The application form also requires the signature of a chief law enforcement officer with jurisdiction in the applicant's residence.
Since the Firearms Owners' Protection Act of May 19, 1986, ownership of newly manufactured machine guns has been prohibited to civilians. Machine guns which were manufactured prior to the Act's passage are regulated under the National Firearms Act, but those manufactured after the ban cannot ordinarily be sold to or owned by civilians.
Source for above info:
http://www.missouricarry.com/ click on FAQ.
Any law abiding, non violent American citizen over 21 years of age, without documented mental health issues has a real good chance of obtaining the necessary permits to own a pre 1986 fully automatic weapon.
These states allow class III gun ownership:
AL, AK, AZ, AR, CO, CT, FL, GA, ID, IN, KY, LA, ME, MD, MA, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NC, ND, OH, OK, OR, PA, SC, SD, TN, TX, UT, VT, WV, WI, WY
The problem is not the legal owners of the weapons but the ability of criminals to get possession of these or any other type of firearms. Securing any weapon from accidental fire by the inexperienced or criminal theft is always the biggest safety concern.
It seems a lot of our stolen weapons are going to Mexico for the drug wars.

- Dale