Heh. Fair point taken.
I have heard that argument regarding the meaning of the word "arms" before. It appears to me that the anti-gunners just made it up. Kind of like creating a thing called an "assault weapon". It took three different laws in Kalifornia to even define such a thing, and the result is a joke since rifles almost identical to those which have been outlawed can be owned legally.
Except, that is, for that near-equivalent to the suitcase nuke, the dreaded plastic pistol grip. Attaching one of those to your rifle could make you a felon, subject to serious prison time.