Further, that such a Right was so fundamental to remaining free men, that even those not subject to militia call up were to be afforded protection for this Right.
Pretty basic really. It's only when gun grabbers and lawyers start trying to find ways around it that things get messy.
I think it's also important to note that the preable of the amendment is irrelevant, regardless of the use of the term "militia", because, as the Emerson Court ruled, the preamble does not limit the right, just as the "WHEREAS" clauses of any law (or contract even) are not construed as substantive clauses.