Well, above at least 3 or 4, especially since apparently occurred pre-Heller
... straw purchase (likely)
... firearm not registered in DC (likely)
... lack of concealed carry permit (likely)
... carry in unauthorized areas in DC (likely)
... off-book financial transactions (for the purchase)
... interstate transport - for the purchase(yes, I know DC is a “District”, but AFAIK one can only bring a gun from an out-of-District purchase in via about only 1 single dealer in DC)
... interstate transport and unauthorized possession/carry (likely, given the trip to CA)
just my semi-educated guess...open to any constructive input from someone with detailed knowledge of WA DC gun restrictions
plus (from page 2):
... hi-cap mag > 10 rounds
... possession of ammunition
... just carrying the darned thing