The fact that the Justice dept. filed an appeal to the SCOTUS should not surprise you. This is a Commerce Clause case, not a 2nd Amendment case. There is so much legislation premised on the Commerce Clause and the overreaching effect of Wickard v. Filburn that it shouldn't be a surprise to anyone they chose to push the issue and see if the SCOTUS would take it. And truth be told, even if they didn't appeal or even if the SCOTUS agrees with the 9th Circuit, it really won't change much for 99.99% of gun owners. Stewart was a very limited case and will not be the death of 922(o). In Stewart, 922(o) was not found to be blatently unconstitutional, only unconstitutional as applied to Mr. Stewart.