Surprised no one took it to the Supreme Court, although the 9th Circuit's thing is apparently "grab a full en banc panel to kill any 3 judge en banc pro-gun ruling."
Nitpick: A three judge ruling is by definition not en banc. En banc is a discretionary appeal internal to the circuit, and is an interesting tradition because neither the prosecution nor the defense can actually make an appeal to it -- it has to be initiated by one of the judges on the circuit.
It's a pretty limited win, but a good one nonetheless.