Hillary Clinton does not believe that an individual has the constitutional right to own any firearm under the Second Amendment, and is committed to appointing Supreme Court justices who will reverse existing decisions which recognize this right as reported by Frank Miniter for Forbes:
Hillary Clinton said the Supreme Court got it "wrong on the Second Amendment." When she said this Hillary must have been talking about the Heller and McDonald (2010) decisions. Both were 5-4 rulings by the Supreme Court. In Heller, the Court determined that the Second Amendment is indeed an individual right. In McDonald, the Court ruled that the individual right to bear arms also restricts state and local governments (not just the federal government). If Hillary thinks the high court got it wrong on these basic questions about the U.S. Bill of Rights, then she clearly would nominate Supreme Court justices who would agree with the minority opinions in both of those rulings. Both of those minority opinions argued vociferously that there is no individual right to bear arms. If a future Supreme Court rules that way then the Second Amendment will be gutted of meaning, or as Donald Trump says, "Abolished."
There is no need for Hillary Clinton to repeal the Second Amendment to implement her extremist gun control agenda. If the Heller and McDonald decisions are reversed by the Supreme Court as Hillary urges, then governments from local municipalities to the U.S. Congress can enact whatever anti-gun laws they want including a complete ban which seizes all firearms from American citizens. We are just one President and one Justice away from an end of the Second Amendment as we know it.
Further reading that may be of interest: