When the U.S. Congress was drafting, debating and ratifying the Second Amendment back in the late 1700s, they could have never imagined the advances in technology, weaponry and warfare that comprise our current arsenal of state-of-the-art defense artillery. They used muskets, pistols, and cannons! It is absurd to try to make any type of reasonable comparison to these incomparable eras and their means of defense.
Nowhere in its verbiage does the Amendment “grant” anybody anything. Like all amendments, it simply is either declaratory or restrictive. None are absolutes. Historically, these founding documents typically deferred to the states for further interpretation.