I never said that the 2A didn't cover more than muskets and sabres. Just that ordnance is not what they were discussing. The debate over that is chronicled and I would have to do some digging in my research papers, but I can get it. The quote you gave is from Adams and was in his support of the Constitution in trying to limit the Federal power over the people. The context is arms, not ordnance. An excellent web site to visit regarding this is
Guncite.orgGuncite.org is an excellent resource for current RKBA info. I prefer Keepandbeararms.com myself.
However, as to what the Founders "meant", it is better to find complete historical resources for exactly what they said. And what they meant.
Arms had a broader definition. Ordnance. Rifle. Gun. Mortar. Cannon. Knives. Swords. Even Grenades.