The constitution also promises free speech and religion but I can’t stand outside your house with a megaphone and promote the godhood of large white bats at midnight.
I’m not against guns or even ARs I just think that blindly reading(not sure how that’s possible) the constitution and assuming what the founders meant is strange. Trying to directly take what they were imagining and applying it today is silly. You have to be able to find a balance. I don’t have the answers but I also don’t think there’s really a purpose in a modern civilization for a guy to walk down the street with a high powered rifle.