The right to bear arms was established as an understood law, prior to 2nd amendment rooted in the "Castle Doctrine" 1600's

What is the definition of Castle Doctrine?

A castle doctrine, also known as a castle law or a defense of habitation law, is a legal doctrine that designates a person's abode or any legally occupied place (for example, a vehicle or home) as a place in which that person has protections and immunities permitting one, in certain circumstances, to use force (up to and including deadly force) to ...

The Constitution

The “castle doctrine,” which originates in the early 1600s. This was the doctrine that you did not have to retreat from an attack if you were in your home, because as the old adage says, a man’s house is his castle.

the Castle Doctrine first began as a common law theory. This means that it wasn’t a written law, but rather an understanding everyone had of the rule. Under common law, a person could use deadly force to defend their home

The 2nd Amendment further established as LAW.

Right to Bear Arms

Passed by Congress September 25, 1789. Ratified December 15, 1791. The first 10 amendments form the Bill of Rights

2nd Amendment states no one or nothing can abridge this right