Prohibits possession of assault weapons, defined as semiautomatic rifles and shotguns capable of holding more than 10 rounds of ammunition at once, either in fixed or detachable magazine, or any other ammunition-feeding device. Possession of handguns is not prohibited. Exempts military and law enforcement personnel in their official duties. Exempts and requires registration of assault weapons lawfully possessed prior to this provision’s effective date. Creates criminal penalties for violations of this amendment.