Why depend on a modern-day opinion of what the amendment means when we have the founders and their contemporaries thoughts on the subject? Here are a few for consideration:
"No Free man shall ever be debarred the use of arms." (Thomas Jefferson, Proposal Virginia Constitution, 1 T. Jefferson Papers, 334,[C.J.Boyd, Ed., 1950])
"Americans have the right and advantage of being armed - unlike the citizens of other countries whose governments are afraid to trust the people with arms." (James Madison, The Federalist Papers #46 at 243-244)
"Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom of Europe. The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed, and constitute a force superior to any bands of regular troops that can be, on any pretense, raised in the United States" (Noah Webster in `An Examination into the Leading Principles of the Federal Constitution', 1787, a pamphlet aimed at swaying Pennsylvania toward ratification, in Paul Ford, ed., Pamphlets on the Constitution of the United States, at 56(New York, 1888))
"Besides the advantage of being armed, which the Americans possess over the people of almost every other nation. . . Notwithstanding the military establishments in the several kingdoms of Europe, which are carried as far as the public resources will bear, the governments are afraid to trust the people with arms." (James Madison, author of the Bill of Rights, in Federalist Paper No. 46.)
"Congress have no power to disarm the militia. Their swords, and every other terrible implement of the soldier, are the birthright of an American... The unlimited power of the sword is not in the hands of either the federal or state government, but, where I trust in God it will ever remain, in the hands of the people" (Tench Coxe, Pennsylvania Gazette, Feb. 20, 1788)
"I ask, sir, what is the militia? It is the whole people, except for few public officials." (George Mason, 3 Elliot, Debates at 425-426)
"The Constitution shall never be construed....to prevent the people of the United States who are peaceable citizens from keeping their own arms" (Samuel Adams, Debates and Proceedings in the Convention of the Commonwealth of Massachusetts, 86-87)
"To preserve liberty, it is essential that the whole body of people always possess arms, and be taught alike especially when young, how to use them." (Richard Henry Lee, 1788, Initiator of the Declaration of Independence, and member of the first Senate, which passed the Bill of Rights, Walter Bennett, ed., Letters from the Federal Farmer to the Republican, at 21,22,124 (Univ. of Alabama Press,1975)..)
"The great object is that every man be armed" and "everyone who is able may have a gun." (Patrick Henry, in the Virginia Convention on the ratification of the Constitution. Debates and other Proceedings of the Convention of Virginia,...taken in shorthand by David Robertson of Petersburg, at 271, 275 2d ed. Richmond, 1805. Also 3 Elliot, Debates at 386)
"The people are not to be disarmed of their weapons. They are left in full possession of them." (Zachariah Johnson, 3 Elliot, Debates at 646)
"Are we at last brought to such humiliating and debasing degradation, that we cannot be trusted with arms for our defense? Where is the difference between having our arms in possession and under our direction, and having them under the management of Congress? If our defense be the real object of having those arms, in whose hands can they be trusted with more propriety, or equal safety to us, as in our own hands?" (Patrick Henry, 3 J. Elliot, Debates in the Several State Conventions 45, 2d ed. Philadelphia, 1836)
"The best we can hope for concerning the people at large is that they be properly armed." (Alexander Hamilton, The Federalist Papers at 184-8)
"That the said Constitution shall never be construed to authorize Congress to infringe the just liberty of the press or the rights of conscience; or to prevent the people of The United States who are peaceable citizens from keeping their own arms..." (Samuel Adams, Debates and Proceedings in the Convention of the Commonwealth of Massachusetts, at 86-87 (Peirce & Hale, eds., Boston, 1850))
"Firearms stand next in importance to the Constitution itself. They are the American people's liberty teeth and keystone under independence ... From the hour the Pilgrims landed, to the present day, events, occurrences, and tendencies prove that to insure peace, security and happiness, the rifle and pistol are equally indispensable . . . the very atmosphere of firearms everywhere restrains evil interference - they deserve a place of honor with all that is good" (George Washington)
"...the people are confirmed by the next article in their right to keep and bear their private arms" (from article in the Philadelphia Federal Gazette June 18, 1789 at 2, col.2,)
"The right of the citizens to keep and bear arms has justly been considered, as the palladium of the liberties of a republic; since it offers a strong moral check against the usurpation and arbitrary power of rulers; and will generally, even if these are successful in the first instance, enable the people to resist and triumph over them. And yet, though this truth would seem so clear, and the importance of a well regulated militia would seem so undeniable, it cannot be disguised, that among the American people there is a growing indifference to any system of militia discipline, and a strong disposition, from a sense of its burthens, to be rid of all regulations. How it is practicable to keep the people duly armed without some organization, it is difficult to see. There is certainly no small danger, that indifference may lead to disgust, and disgust to contempt; and thus gradually undermine all the protection intended by this clause of our national bill of rights." (Joseph Story, Commentaries on the Constitution of the United States; With a Preliminary Review of the Constitutional History of the Colonies and States before the Adoption of the Constitution [Boston, 1833])