The Second protects that power from the feds.
Incorporating the 2nd under the 14th will require that a minimum federal standard of 2nd amendment right be sestablished and enforced upon the states (they will be able to exceed that minimum- but not fall below it).
If that is done faithfully to the Constitution it will be like Keyes envisions here. Advanced weapons will be more restricted, but available.
I don't know how YOUR state works, but in every state I've lived in, the state constitutions have had an equivalent of the second amendment.
Try again.