The question is NOT which guns the 2nd Amendment allows. The 2nd Amendment, as do ALL of the Bill of Rights, declares the rights of the people and re enforces the Constitutional restriction that the Federal Government can do NOTHING without “delegated powers” to do so.
The ONLY “delegated powers” re: the militia are stated in Article I, Section 8.15-16 which RESTRICTS the Federal Gov’t to “such part of the militia which is CALLED INTO SERVICE and EMPLOYED!!
“9. The Second Amendment might require full-blown military arms to fulfill the original intent”
Heh. didn’t Miller basically say permitted [fire]arms should be those in use, or useable, by the military? Of course it also concluded that sawn-off shotguns were not military-style and could be banned, despite the use of such “trench sweepers” in the then-recent World War.