republicans,guns, 14th Amendment

Second Amendment as Written
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. When the NRA and like organizations refer to the amendment and discuss its application, they most often treat it as if it were written as follows:

The right of the people to keep and bear Arms, shall not be infringed.
What happened to the first part, "A well regulated Militia, being necessary to the security of a free State,? What happened to that first phrase????

Why are those words in there (up front, at that)?
How does including the first part change the content of the Amendment?
What did they mean by including the first phrase?
I have not seen any even discussion of that.
It's as if those 13 out of 27 words are not even there. Why???

We could have a like discussion about the 14th Amendment with those who claim that
they revere the Constitution, "take our country back to the Constitution."
I hear and read that only the radicals that claim devotion to our Constitution want to change it, throw parts of it out.

How ironic. More phony political republican rhetoric, seems to me.