They simply guaranteed the individual states the right to maintain "well-ordered militias". Since the founders disapproved of standing national armies in peacetime, they needed a means to arm the State against the citizenry, to quell rebellions (especially slave uprisings) and defend against Indian attacks, civil unrest, tax rebellions, and other public disorders.

In the days of relatively expensive muzzle loading firearms and life on the farm and frontier, gun ownership by individuals was not seen as a threat to public order. Guns only became dangerous when owned by large groups of people under unified command--armies, armed insurrections or warlike native tribes.

Although ownership of firearms was not specifically forbidden by Federal Law, gun ownership by private individuals was never a constitutional right until it was determined as such by the Supreme Court in 2008.

That why we have a Supreme Court, so the Constitution can be interpreted in each new age. In that sense, it is a Second Amendment Right now, today, legally, whether we like it or not. It may not be a good idea, but its the law. Even so, SCOTUS left plenty of leeway to the States to regulate trade and use of firearms.

But it ain't got shit to do with the founding fucking fathers.