Far be it for me to try to explain the bureaucratic mindset, but imagine law enforcement personnel getting word that a certain culprit is possessing or shooting a machine gun. You get there and he/she has a stock AR-15, but also has, stored nearby but not together, a drop-in auto sear and various M16 parts. Using this ruling you can bust him. Or her.
It all seems a bit more convoluted when discussing a WW1 Luger, however.
dju
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