Legally in Hawaii you can't own "assault pistols". Thus there is no such thing.
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By that stellar logic, there should be no penalties in the statute for possession of an assault pistol, because you can't possess something that doesn't exist ("no such thing").
Stop trying to Omni-splain everything. This is NOT your area of expertise (which has yet to be determined).
You can't "legally own" suppressors, short-barrel rifles, pistol mags over 10rds, fully automatic firearms, nor any other NFA controlled item, so I guess none of those exist in the state, either. Try Googling those items as they relate to arrests in Hawaii. I BET YOU there are many stories where these items are "a thing." I know. I checked.
Your perception of reality is still governed by what the courts and lawmakers dictate to you, even though reality and the legal system are often at odds with one another.