Thanks for this info. It's been years, but I've just sold a shotgun to another Hawaii resident and the information below is very helpful:

    In all cases where a rifle or shotgun is acquired from another person within the State, the person who is transferring title to the rifle or shotgun shall submit, within forty-eight hours after transferring the firearm, to the authority which issued the permit to acquire, the following information, in writing:  name of the person who transferred the firearm, name of the person to whom the title to the firearm was transferred; names of the manufacturer and importer; model; type of action; caliber or gauge; and serial number as applicable.

I have a question, should I meet with the buyer, who mentions he has a valid rifle/shotgun permit, at HPD headquarters to complete the transaction? Or, can it be done elsewhere while remaining legal?

From the HRS and BATFE

Re State of Hawaii:
http://www.capitol.hawaii.gov/hrscurrent/Vol03_Ch0121-0200D/HRS0134/HRS_0134-0002.htm

(f)  In all cases where a pistol or revolver is acquired from another person within the State, the permit shall be signed in ink by the person to whom title to the pistol or revolver is transferred and shall be delivered to the person who is transferring title to the firearm, who shall verify that the person to whom the firearm is to be transferred is the person named in the permit and enter on the permit in the space provided the following information:  name of the person to whom the title to the firearm was transferred; names of the manufacturer and importer; model; type of action; caliber or gauge; and serial number as applicable.  The person who is transferring title to the firearm shall sign the permit in ink and cause the permit to be delivered or sent by registered mail to the issuing authority within forty-eight hours after transferring the firearm.

     In all cases where receipt of a firearm is had by mail, express, freight, or otherwise from sources without the State, the person to whom the permit has been issued shall make the prescribed entries on the permit, sign the permit in ink, and cause the permit to be delivered or sent by registered mail to the issuing authority within forty-eight hours after taking possession of the firearm.

     In all cases where a rifle or shotgun is acquired from another person within the State, the person who is transferring title to the rifle or shotgun shall submit, within forty-eight hours after transferring the firearm, to the authority which issued the permit to acquire, the following information, in writing:  name of the person who transferred the firearm, name of the person to whom the title to the firearm was transferred; names of the manufacturer and importer; model; type of action; caliber or gauge; and serial number as applicable.


Re BATFE (ATF)
https://www.atf.gov/content/firearms-frequently-asked-questions-unlicensed-persons

Q: To whom may an unlicensed person transfer firearms under the GCA?
A person may sell a firearm to an unlicensed resident of his State, if he does not know or have reasonable cause to believe the person is prohibited from receiving or possessing firearms under Federal law. A person may loan or rent a firearm to a resident of any State for temporary use for lawful sporting purposes, if he does not know or have reasonable cause to believe the person is prohibited from receiving or possessing firearms under Federal law. A person may sell or transfer a firearm to a licensee in any State. However, a firearm other than a curio or relic may not be transferred interstate to a licensed collector.
[18 U.S.C. 922(a)(3) and (5), 922(d), 27 CFR 478.29 and 478.30]

Q: From whom may an unlicensed person acquire a firearm under the GCA?
A person may only acquire a firearm within the person’s own State, except that he or she may purchase or otherwise acquire a rifle or shotgun, in person, at a licensee’s premises in any State, provided the sale complies with State laws applicable in the State of sale and the State where the purchaser resides. A person may borrow or rent a firearm in any State for temporary use for lawful sporting purposes.
[18 U.S.C. 922(a)(3) and (5), 922(b)(3), 27 CFR 478.29 and 478.30]

Thanks for this info. It's been years, but I've just sold a shotgun to another Hawaii resident and the information below is very helpful:

    In all cases where a rifle or shotgun is acquired from another person within the State, the person who is transferring title to the rifle or shotgun shall submit, within forty-eight hours after transferring the firearm, to the authority which issued the permit to acquire, the following information, in writing:  name of the person who transferred the firearm, name of the person to whom the title to the firearm was transferred; names of the manufacturer and importer; model; type of action; caliber or gauge; and serial number as applicable.

I have a question, should I meet with the buyer, who mentions he has a valid rifle/shotgun permit, at HPD headquarters to complete the transaction? Or, can it be done elsewhere while remaining legal?

You don't have to meet at hpd, but I always do just to make sure everything is done correctly.

Thank you for your quick reply and the helpful information. The buyer has agreed to meet me at HPD. 

You don't have to meet at hpd, but I always do just to make sure everything is done correctly.