Close.
If they were considered Citizens of the state in which they lived, then they would have the same rights as other Citizens of that state, including the right to keep and bear arms, free speech, etc. The individual right to keep and bear arm is protected by state constitutions.
The bottom line in Dred Scott was that the states did not have the power to declare "persons of the Negro race" citizens -- that was a power reserved to the federal government. Meaning the newly freed slaves had no rights at all (and were treated that way).
The solution was the 14th amendment, which declared them "citizens of the United States" and protected some basic privileges and immunities.
This amendment is meant for the people.