"Well-equipped" in modern English.
A quick search found this list of examples: https://www.learnaboutguns.com/2019/08/11/the-meaning-of-wel...
(linking to that site rather than its source since the source is sending a bad SSL cert)
There are other writings by the Founding Fathers from the time of the ratification of the US Constitution reiterating the need of a right for people to own arms in case it's necessary to overthrow the government, specifically including the government they had just created.