When applied to the Constitution the term living document is leftist propaganda used for evisceration of the Constitution and usurpation. It always increases federal power. It never reduces or limits power.
For the rule of law, the Constitution, to exist, its meaning must remain static. It is not a living document, evolving and conforming to changing times or experiences. The lawful remedy to such issues lies in the amendatory process. James Madison reminded Congress in 1817 that the framers had “marked out in the Constitution itself a safe and practicable mode of improving it as experience might suggest.”
Thomas Jefferson believed the Constitution could be understood by the average person. But to understand it one must interpret it in light of original intent. Read the Constitution. For clarity study the Declaration of Independence, the Federalist and Anti-Federalist papers, George Washington’s farewell address and other foundational works. The founder’s own words provide the blueprint for understanding.
Jefferson voiced this admonition: “On every question of construction, carry ourselves back to the time when the Constitution was adopted, recollect the spirit manifested in the debates and instead of trying what meaning may be squeezed out of the text, or invented against it, conform to the probable one in which it was passed.”
In light of that original intent one must conclude the Second Amendment guarantees our God-given right to own and bear arms for self defense, self preservation and as a means to deter and repel tyrannical government.
Those arms necessarily must include state of the art firearms equivalent to the military style weapons of the day (the era in which we live). Why? Because we are citizen soldiers (militia) entrusted with the duty to preserve and defend liberty.