Gun rights supporters don't use the 2nd Amendment to justify their version of "guns rights" because the 2nd Amendment is not the source of the right to arms.
It is those who wish to deny the individual, unconditioned right who twist and distort the words of the Amendment to pervert the fundamental principles of the Constitution (conferred powers and retained rights) to invent conditions, qualifications and restrictions on the right.
I, as a gun rights supporter would prefer to just justify my version of gun rights on 140 years of Supreme Court holdings re-re-re-affirming that the right to arms is not granted by the 2nd Amendment thus it is not in any manner dependent upon the words of the Amendment to exist.
I don't claim my right to arms comes from what the 2nd Amendment says, I possess the right because of the absolute silence of the Constitution allowing government to have a say!
Yeah, that suits me just fine.