At the time the Constitution was passed, between 50% and 75% of male property owners had guns. We know this because sometimes state governments, and sometimes counties, would go house to house conducting a census. Not infrequently, one of the questions asked would be if the homeowners had a gun, what kind it was, and if they could see it. Historians went back, averaged and guesstimated, and came up with those numbers. Interestingly, between 6% and 38% of female-owned estates had guns too.