"18 year olds can fight in war should be able to buy an assault weapon..."
Ok...then we should license (enlistment), train (basic training) and supervise all 18 y/o with any such weapon.
Then argument doesn't work. It's not the same.
It's not a different standard as long as we license, train and supervise said person.
As one NRA member attendee said, "Raise the age limit to 25...that's a start"