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.
State and county law enforcement officers who are not convicted of an offense involving abuse of a family or household member under 709-906 can own and possess Silencers and Machine Guns and Short Barreled Shotguns (SBS) and Short Barreled Rifles (SBR).
In Hawaii you cannot own the following NFA restricted items.
Machine Guns Silencers*
Short Barreled Shotguns (SBS)*
Short Barreled Rifles (SBR)*
Any Other Weapon (AOW)
Destructive Devices (DD)
Follow this link to find out more about Hawaii and NFA restrictions on Class 3 Firearms