Stevens, Souter, Ginsburg, and Breyer will vote for the "collective" interpretation. Rhenquist, Scalia, and Thomas will definitely go individual. Kennedy leans individual. That leaves, as always, O'Connor. She's backed Garwood before in U.S. v. Lopez, but for this case, the stakes are VERY high. A loss here, and we are screwed big time.
Not if you own unregistered armaments, and lots of them.
At least it will take them quite a while to get their hands on yours...