The right to keep and bear arms exists even in the absence of the second amendment.
It has been several times truly remarked, that bills of rights are in their origin, stipulations between kings and their subjects, abridgments of prerogative in favor of privilege, reservations of rights not surrendered to the prince. Such was Magna Carta, obtained by the Barons, sword in hand, from king John...It is evident, therefore, that according to their primitive signification, they have no application to constitutions professedly founded upon the power of the people, and executed by their immediate representatives and servants. Here, in strictness, the people surrender nothing, and as they retain every thing, they have no need of particular reservations.
-Federalist No. 84