Maybe it doesn't, but the fact that States have powers not delegated to the Feds carries a lot of weight. In light of recent decisions this doesn't give them the power on outright gun bans but it does give them significant power nonetheless. Personally I don't care much about restricting State and local power because I still have the freedom to move around and choose the State that gives me the freedoms that are important to me, and that in essence is the true power of the American system of government.