There are several type of Title II firearms which are sold by Class 3 SOT FFLs that are restricted by the National Firearms Act.
Each state can impose additional restrictions on the sale, purchase, and transfer of these Title II firearms in addition to the compliance that is required with the National Firearms Act.
In Hawaii you can own the following items that are regulated the the National Firearms Act
Individuals cannot own any NFA firearms which are kept within HI.