Why a permit to acquire? You're not purchasing, trading or bartering for a pre-built handgun. You ARE the manufacturer. Nowhere in HRS 134 does it mention 80% must have a permit to build. It's the same as bringing in from out of state. Once you make it an 81% you have to take and register.
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Why a permit to acquire?
HRS 134-2 (a)
No person shall acquire the ownership of a firearm, whether usable or unusable, serviceable or unserviceable, modern or antique, registered under prior law or by a prior owner or unregistered, either by purchase, gift, inheritance, bequest,
or in any other manner, whether procured in the State or imported by mail, express, freight, or otherwise,
until the person has first procured from the chief of police of the county of the person's place of business or, if there is no place of business, the person's residence or, if there is neither place of business nor residence, the person's place of sojourn,
a permit to acquire the ownership of a firearm as prescribed in this section. When title to any firearm is acquired by inheritance or bequest, the foregoing permit shall be obtained before taking possession of a firearm; provided that upon presentation of a copy of the death certificate of the owner making the bequest, any heir or legatee may transfer the inherited or bequested firearm directly to a dealer licensed under section 134-31 or licensed by the United States Department of Justice without complying with the requirements of this section.
It doesn't matter if you're the manufacturer. HRS doesn't have to mention 80% or permit to build. None of that is relevant, because it is clear that one can not acquire/own/possess a firearm (in any manner) without first getting a permit to acquire.