On gun control I feel that the second clause determines the right of everyone to own a gun (obviously certain people such as ex-felons/violent criminals shouldn't be allowed to) and under the 9th amendment, states (or in some cases they should defer to local governments) should be able to set their own policy what sort of guns are allowed to bought/used/possesed in that state.
The ninth amendment says nothing about states, and if anything it disproves your point.
I see this as meaning no state can infringe on the Constitution and as the government is already laid out, with superior clause, the state government cannot do anything to contradict the Constitution thereby enhancing our freedom to bear arms.
Oops, I meant 10th amendment. And like AuH2O the 14th amendement would apply the 2nd amendment to all the states so no state could deny anyone (with a few exceptions) the right to own a gun, but they can place restrictions on which types of firearms can be possessed/sold, etc.