But I think for the most part in the modern day discussion its' automatic weapons, large capacity magazines, large caliber weapons, hand grenades RPG's, Mortars and up.....ect.
That's a distinction the founders never made. At the time, civilians owned cannons and bombs.
If there is a constitutional amendment to clarify the meaning of "arms" and "the People" and "shall not be infringed" then fine, but States still have the power. The 2nd is a restriction on the federal government, making the BATF and all fed gun laws illegal and unconstitutional. We simply have had people on the Court without the guts or integrity to force the government to do it the right way.
They never made it because all citizens were expected to participate in their States Militia. They never expected to have a large standing National Army either.
Clearly the 2nd Amendment was tied to the Well-Trained Militia's, until the liberal courts separated and ignored the Militia aspect of what the founder wrote.
I don't disagree with the courts mind you, I just think we need a new Amendment to replace the Second that clearly defines the rights of citizens to own these weapons.