From David T. Hardy:

This article proposes third approach, which is better founded in the historical record. The militia clause and the right to arms clause are completely separate concepts. They have different origins, one looking back to the Renaissance, the other forward to the Enlightenment. In 1787-91 they largely had different constituencies: some Americans were concerned that the new Congress would neglect the militia, others that it might disarm the people. For most of this period, drafters of State declarations of rights, or of proposals for a Federal bill of rights, chose either to praise the militia as an institution, or to guarantee an individual right to arms, but never both.