True enough, Our RKBA's is an inate, self-evident, and inalienable individual right. -- It is not "confered"..
It limits the federal government from abridging RKBA. There is a subtle difference.
It limits ~any~ level of government in the USA from infringments.
The 2nd amendment does not limit state governments from trampling on RKBA. The state's constitution is responsible for establishing that protection.
You did not give any reason why your reading must be the correct one.
Why on earth do you WANT a state to have the power to infringe upon one of your inalienable rights?
Your position makes no sense.
I do not want any state to have the power to infringe on rights, quite the contrary. However, there is no certain way of guaranteeing it. The Constitution does not create any federal apparatus for reaching down into the states and adjudicating whether or not the state has fulfilled its responsibility of protecting individual rights.