In the opinion of the Supreme Court in U.S. vs Miller, the following excerpts are found:
"The signification attributed to the term Militia appears from the debates in the Convention, the history and legislation of Colonies and States, and the writings of approved commentators. These show plainly enough that the Militia comprised all males physically capable of acting in concert for the common defense. 'A body of citizens enrolled for military discipline.' And further, that ordinarily when called for service these men were expected to appear bearing arms supplied by themselves and of the kind in common use at the time."
"In the absence of any evidence tending to show that possession or use of a 'shotgun having a barrel of less than eighteen inches in length' at this time has some reasonable relationship to the preservation or efficiency of a well regulated militia, we cannot say that the Second Amendment guarantees the right to keep and bear such an instrument. Certainly it is not within judicial notice that this weapon is any part of the ordinary military equipment or that its use could contribute to the common defense."
Therefore, according to the opinion of the Supreme Court in U.S. vs Miller, every physically capable adult male has not only the right, but the duty, to keep and bear an M16, the weapon in common use by the military at this time. There is also a great degree of certainty that the Supreme Court would have also ruled for Miller had the government attorneys properly informed the court that sawed-off shotguns were also used by the military in previous wars.