If I were to construct an argument to justify my right to “keep and bear arms” (including alleged “assault rifles”) under the 2nd Amendment, that argument might consist of several of the following parts:
1) Founders’ Purpose for 2nd Amendment
As I explained in The Purpose of the 2nd Amendment, we can learn the Founders’ intended purpose for the 2nd Amendment by reading the “Preamble to the Bill of Rights”.
According to that Preamble, the purpose for the 2nd Amendment is not to empower Americans to hunt deer or ducks, or defend against an attack by Indians or even an invasion by Great Britain. We retain the right to “keep and bear arms” so that we can shoot officers, officials, judges, bureaucrats and employees of the federal government who “abuse or misconstrue” their powers under The Constitution of the United States. In other words, the 2nd Amendment is intended to guarantee that we have the necessary “equipment” to shoot those members of our own federal government who attempt to subject this nation to despotism (tyranny).