Taxing a right is illegal
From Publicola:
Mark possessed machine guns assembled from kits and was arrested for violating the 1934 NFA, which specifies that machine gun ownership requires paying a special tax. Publicola thinks that Mr. Lancaster’s case could be used to overturn the 1934 NFA. I’m no lawyer, but it seems Publicola makes a strong case so, as they say, read the whole thing.
Here’s the Free Mark Lancaster site.