-=> Quoting Lyle Knox to Guy Putnam <=-
 LK>> Don't you also have to keep the paperwork with the gun at all times,
 LK>> including while you're out shooting it?
 
 GP> Yes, you are supposed to keep the permit with you when
 GP> toting it around. You'd want to anyway, in case you got
 GP> searched by cops.  The cops could call ATF's NFA Branch in
 GP> DC to find out you were ok, but NFA Branch isn't open on
 GP> the weekends . . . .
 LK> My little bro' went on a machine-gun shoot with a buddy of his and one
 LK> guy brought out a 20mm cannon.  Each round was serial numbered and had
 LK> to catalogued as it was fired.  Needless to say, he didn't fire too
 LK> many off at any one time.  :-)  I =think= each separate round was
 LK> considered a "destructive device" and had to have a tax paid on it.
Yes.  If they were explosive rounds instead of solids, they are destructive
devices.  Most owners of automatic cannons use solid rounds, unless they
are DD dealers.  Otherwise, they have to pay a $200 tax on each round. 
I'll _bet_ he didn't fire many.
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