Haw. Rev. Stat. § 134-10.2: Manufacturing, purchasing, or obtaining firearm parts to assemble a firearm having no serial number; penalty.

(a) A person who is not licensed to manufacture a firearm under section 134-31, or who is not a dealer licensed by the United States Department of Justice, shall not, for the purpose of assembling a firearm, possess, purchase, produce with a three-dimensional printer, or otherwise obtain separately, or as part of a kit:

(1) A firearm receiver that is not imprinted with a serial number registered with a federally licensed manufacturer;

(2) A firearm receiver that has not been provided a serial number that may be registered in accordance with section 134-3(c); or

(3) Any combination of parts from which a firearm having no serial number may be readily assembled; provided that the parts do not have the capacity to function as a firearm unless assembled.

(b) Violation of this section is a class C felony.