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Good research. As an aside there was an interesting exhibition at the British Library last year on the Magna Carta, and it showed how the Magna Carta influenced subsequent laws, bills, acts, etc. around the world. There was a discussion of the former colonies, and while bringing some variant/derivative of the Magna Carta to those regions was at the time seen as beneficial in helping them become more 'civilised', it was later viewed in a negative light by having served as a way of imposing colonial control.
Just did some digging about the history of the 2nd amendment.
It was likely lifted from the English Bill of Rights that is most notable for separating the monarchy from parliament but also granted the right to all civilians to bear arms. At the time, only Catholics were allowed to carry a sword so the idea was to allow protestants to be armed also. It was a statement of religious equality.
They didn't even start using firearms in a widespread way for another 150 years ffs.