it should be fine.
Check out HRS134 here:
http://www.capitol.hawaii.gov/hrscurrent/Vol03_Ch0121-0200D/HRS0134/In particular, the section pertaining to prohibited "Assault Pistols":
"Assault pistol" means a semiautomatic pistol which accepts a detachable magazine and which has two or more of the following characteristics:
(1) An ammunition magazine which attaches to the pistol outside of the pistol grip;
(2) A threaded barrel capable of accepting a barrel extender, flash suppressor, forward hand grip, or silencer;
(3) A shroud which is attached to or partially or completely encircles the barrel and which permits the shooter to hold the firearm with the second hand without being burned;
(4) A manufactured weight of fifty ounces or more when the pistol is unloaded;
(5) A centerfire pistol with an overall length of twelve inches or more; or
(6) It is a semiautomatic version of an automatic firearm;
but does not include a firearm with a barrel sixteen or more inches in length, an antique pistol as defined in this section or a curio or relic as those terms are used in 18 United States Code §921(16) or 27 Code of Federal Regulations 178.11.