Seems simple enough to me . . . what part is confusing to the NRA? or perhaps to this bozo?
Progressives believe the Constitution is a LIVING document that can be interpreted according to the prevailing culture.(which is absolutely incorrect) They don’t want the ORIGINAL INTENT to be the defining law. Hence they RE-interpret the Constitution to fit their ideology.
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.
A very important distinction and one that changes the meaning and intent of the entire sentence. The version that was ratified was more in keeping with the language of the times...as can be seen in other writings from that era.