The Second Amendment reads:
"A well regulated Militia, being necessary to the security of a free State, the
right of the people to keep and bear Arms, shall not be infringed."
The Second is the ONLY one of the Bill Of Rights to contain such an explanation for the protected right.
The Constitution is clear about the purpose and outlines of this well-regulated militia. The details were fleshed out in the Militia Acts of 1792. I suspect none of us belong to this Citizen's Militia... which are now the state National Guards... and even if we do, we're no longer expected to provide our own firearms.
One might think that would make this Amendment the LEAST subject to being misinterpreted or hijacked, yet this is exactly what's happened. So what happened.