Mark Knapp a Washington Gun Trust Lawyer® and firearms lawyer has written a blog that deals with the possibility of obtaining a legal machine gun in the State of Washington.
Generally Machine guns have been illegal to import or transfer in Washington State since 1994 and then only those that were manufactured and registered with the NFA before the 1985 ban were permitted. Those who owned them prior to the 1994 Washington ban could keep them.
There seems to be some ambiguity in the law which may permit certain people to obtain certain Machine Guns. It would not be an easy process and would involved a WRIT OF MANDAMUS which Mark called a long shot.
If you are interested in this you may want to ready his blog on Machine Guns in Washington may be legal
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