I see the point you were trying to make. As absurd as it is, they get away with gun control by saying “weeeelllll it’s not reeeeaaallly in infringement because you can still own a bolt action hunting rifle and an over/under shotgun”. Kind of hard to say the amendment doesn’t really mean 18 years old. And as hypocritical as it would be, no anti-2A judge will say you aren’t really abridging the right to vote for 18-20 year olds by increasing the voting age to 21, even though they can still vote once 21.