Reference §HRS 134-3
Every person arriving in the state who brings or by any other manner causes to be brought into the state a firearm of any description, whether usable or unusable, serviceable or unserviceable, modern or antique, shall register the firearm within 72 hours (three days) after arrival of the person or firearm, whichever arrives later.
Every person who acquires a firearm pursuant to section 134-2 shall register the firearm in the manner prescribed by this section within five days of acquisition.
Registration shall not be required for:
Any device that is designed to fire loose black powder or that is a firearm manufactured before 1899;
Any device not designed to fire or made incapable of being readily restored to a firing condition; or
All unserviceable firearms and destructive devices registered with the Bureau of Alcohol, Tobacco, and Firearms of the United States Department of the Treasury pursuant to Title 27, Code of Federal Regulations.
After purchase or acquisition of the firearm return to the HPD Firearms Section no later than 5 calendar days with the following.
Complete the firearms registration form and sign the firearms registration card.
There is no 14-day waiting period for Out-of-State Registration. Once the firearm arrives in the state you have 3 calendar days, (72 Hours), to bring it in to the Honolulu Police Department Firearms Section.
Please have a valid photo identification and proof of citizenship, if born outside the United States, bring proof of citizenship such as an Original US Passport, Original Naturalization Certificate, Original Born Abroad Certificate, or if you are in the military your Enlisted (ERB) or Officer (ORB) Record Brief will suffice only if the document states you are a United States Citizen.
Married couples who would like to have their firearms jointly registered in both names need to also bring the Original Marriage Certificate.