Haw. Rev. Stat. § 134-15: Restriction of materials for manufacture of pistols or revolvers.

(a) It shall be unlawful for any person, including a licensed manufacturer, licensed importer, or licensed dealer, to possess, sell, or deliver any pistol or revolver the frame or receiver of which is a die casting of zinc alloy which has a melting temperature of less than 800 degrees Fahrenheit.

(b) This section shall not apply to any pistol or revolver duly registered prior to July 1, 1975, pursuant to section 134-3 or to any antique pistol or revolver.