Hmmm. I was just looking at a few articles. It would be possible (not necessarily probable, but possible) for the House to start up an impeachment of Obama if he attempted to use an executive order to create a strict gun ban. As far as I know they only need a simple majority to pass it and send it on to the Senate.
Oh, thou clear spirit, of thy fire thou madest me, and like a true child of fire, I breathe it back to thee.