Let me just confirm that vranasaurus and Al Norris are correct about double jeopardy. One can be tried both for a state criminal charge and a federal criminal charge without violation double jeopardy, even if each charge is based on the same facts.
You might remember the Rodney King incident in the early 1990s. The four police officers who were involved in his beating were charged under state law with various "excessive force" crimes, tried in state court and acquitted (well, one drew a hung jury as to one charge). They were subsequently tired in federal court on federal charges involving the same incident and facts, and two of the officers were convicted and sent to federal prison.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper