Sentence-Criminal Law- s 3(1) and s 30 of the Firearms Ordinance Cap 18.09-Possession of Ammunition-Mandatory Minimum Sentences-Exceptional Circumstances-Principles of Sentencing- Section 21 of the Constitution-Plea of Guilty-Law ReformSentence-Criminal Law- s 3(1) and s 30 of the Firearms Ordinance Cap 18.09-Possession of Ammunition-Mandatory Minimum Sentences-Exceptional Circumstances-Principles of Sentencing- Section 21 of the Constitution-Plea of Guilty-Law Reform