St George Tucker, writing in Blackstone's Commentaries, 1803, noted that in the United Stated there were no conditions placed on gun ownership: "The right of the people to keep and bear arms shall not be infringed...".
William Rawle (1825), a noted early American legal scholar, restated the original intent and understanding of the 2nd Amendment:
No clause could by any rule of construction be conceived to give to congress a power to disarm the people. Such a flagitious attempt could only be made under some general pretence by a state legislature. But if in any blind pursuit of inordinate power, either should attempt it, this amendment may be appealed to as a restraint on both.
The US Supreme Court agreed with this in the 2007 Heller case, Justice Scalia writing for the Court:
The right of the whole people, old and young, men, women and boys, and not militia only, to keep and bear arms of every description, not such merely as are used by the militia, shall not be infringed, curtailed, or broken in upon, in the smallest degree.