It is not coincidence that Individual Liberty and the wide spread ownership of firearms were born at the same time and in the same place… America.
The key to liberty is that the citizens be on an equal footing with government. This could not have occurred in the the period before guns, because it takes a minimum of two years of consistent training to make a semi-competent swordsman. I know because I train in swordmanship. Farmers and working people do not have to time to devote to this. The American Revolution for freedom and independence began and succeed as a result of the American Colonists being individually armed on an equal level as the tyrants who oppressed them.