Sorry about the late reply. HI law requires a permit and registration of the part with the serial number. I was mistaken in my earlier post. Typically the lower shows the serial number on an AR-15. Not sure how it'll go down if you ship it. However, you'll likely need a permit to buy a new lower here and will have to go through pain of at least 3 visits to HPD. I'd just bring your whole rifle and make a single trip to HPD if I were you.
does HI have a window tinting restriction?