Just about everything Scalia has said and done since and including Bush v. Gore, Haich v. US, etc., has proven that is a legal hack and political whore to his party and special interests attached thereto.
So therefore it comes as no surprise that how he would "interpret" the 2A is 180 degrees directly opposite from the the 2A is actually about, to please his R party masters. The 2A is about ensuring that the citizens have the very *same* arms as those in the hands of standing military. He interprets the 2A to be those arms which are NOT commonly used in the military. It's a devastating loss, in truth (relative to the the true meaning of the 2A), and paves the way for virtually any type of ban or restriction that comes down the pike. The circular reasoning is indeed absolutely absurd and nonsensical, as pointed out by the dissent. The ONLY reason short-barreled shotguns are not common is because they're highly burdensome due to the '34 Act. So it's ridiculous to say that banning them is OK since they're not commonly used. I for one would use about a 12 incher for home defense but for NFA '34.
Curse ye George Bush I, for appointing Souter, Curse ye Gerry Ford for appointing Stevens, Curse ye American people for putting Clinton in office to appoint Ginsburg and Breyer, and most of all curse ye Scalia, Thomas, Alito, and Roberts for not standing up for the obvious truth as evidenced by the history and text. To a lesser extent, ditto to Kennedy.
Make no mistake - the camel's nose is under the tent, and if any more D. Party POTUS's get in office, we're doomed. The only bright side of this is, nothing could possibly make clearer why Obama the happy gun-banner MUST - MUST be defeated. McCain MUST win this election, or we're dead meat since we're sitting on a razor-thin 5-4 and that margin doesn't really even protect ANYTHING, except the extrordinarily narrow limited circumstance of using "a" "handgun" in the "home" for "self-defense".
A very shallow, hollow, short-lived "victory" indeed.