United States v. Miller, 307 U. S. 174, does not limit the right to keep and bear arms to militia purposes, but rather limits the type of weapon to which the right applies to those used by the militia, i.e., those in common use for lawful purposes.
I would agree with this statement IF
Gura's qualifying clause of (essentially) "in common use or WOULD BE in common use had they not been banned."
There are very, very few weapons that would not meet the "Common Use" criteria under "Gura's Clause". Certainly all "small arms" of every type would be in common use, were they legal... they were until 1986.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.