The finding on "dangerous and unusual" reads
2. Like most rights, the Second Amendment right is not unlimited.
It is not a right to keep and carry any weapon whatsoever in any
manner whatsoever and for whatever purpose: For example, con-
cealed weapons prohibitions have been upheld under the Amendment
or state analogues. The Court’s opinion should not be taken to cast
doubt on longstanding prohibitions on the possession of firearms by
felons and the mentally ill, or laws forbidding the carrying of fire-
arms in sensitive places such as schools and government buildings, or
laws imposing conditions and qualifications on the commercial sale of
arms. Miller’s holding that the sorts of weapons protected are those
“in common use at the time” finds support in the historical tradition
of prohibiting the carrying of dangerous and unusual weapons.
Now, the SC indulged in a little legal verbal sophistry here, not unlike with Miller.
Miller did not say that that sawn off shotguns were not part of TOE for the military, they said that no evidence to the contrary had been presented to them to that effect so they weren't going to say it did.
Same goes here.
The Court’s opinion should not be taken to cast
doubt on longstanding prohibitions on the possession of firearms by
felons and the mentally ill, or laws forbidding the carrying of fire-
arms in sensitive places such as schools and government buildings, or
laws imposing conditions and qualifications on the commercial sale of
arms.
This does NOT mean that these prohibitions are constitutionally unchallengeable it means the case was not about this and as such they stay as is, UNTIL they are challenged on constitutional grounds at which point a determination can be made.
Ditto on "dangerous and unusual", the case was not about that and as such we cannot rule on what this exactly means YET.
IMHO, it will cover Nuclear, Biological and Chemical weapons as these are inherently dangerous, unusual and indiscriminate by nature and design.
It will cover things like MOAB fuel air bombs, cluster bombs, mines and other area denial munitions and weapons but would be extraordinarily difficult to extend to anything that is man portable such as an M16, SAW, etc.
Expect lawyers to make a fortune on whether the AND in "dangerous and unusual" means AND or means OR.......