State gun laws are covered in HRS 134 and can be found here

Hawaii requires a permit to purchase a firearms, 1 permit per year for rifles and a permit for each pistol purchase.
Hawaii requires registration of all firearms.
Hawaii requires a medical waiver for all permits and registrations.
Hawaii requires entry into an FBI database of all firearms owners.
Hawaii has a 14 day waiting period on all purchase permits.
Hawaii has a 10 round limit on magazines that can fit in a pistol.
Hawaii bans assault pistols (based on characteristics).
Hawaii bans SBR’s and SBSG’s.
Hawaii has NO carry permits (open or concealed) issued to civilians.
Hawaii limits the places you may take a firearm or ammo.