http://www.capitol.hawaii.gov/hrscurrent/Vol03_Ch0121-0200D/HRS0134/HRS_0134-0001.htm "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;
The charger pistol has two or more disqualifying characteristics.
1) X, mag outside of grip
2) X, bbl is threaded
3) O, n/a
4) X, according to Ruger's spec. sheets most models are listed at 50 oz or more
5) O, n/a
6) O, n/a the 10/22 or charger are not manufactured as fully automatic, however like most semi firearms they can be converted
Hope that helps
http://www.ruger.com/products/22Charger/models.html