It's worse than that actually. If it's ~similar~ to a gun on the named list then it's an assault weapon under this interpretation. What does similar mean?
"Similarity Test: A weapon is a Copy or Duplicate if its internal functional components are substantially similar in construction and configuration to those of an Enumerated Weapon. Under this test, a weapon is a Copy or Duplicate, for example, if the operating system and firing mechanism of the weapon are based on or otherwise substantially similar to one of the Enumerated Weapons."
So it's similar if it's similar. Clear enough?