Ignoring all of Joe’s bad advice....exactly why would our world be safer with less AR-15’s and more shotguns?
Would Adam Lanza have done less damage/killing with a shotgun? No.
If someone really wanted a person dead, they'd use a shot gun. It's hard to miss the target, and the hole left behind would unrepairable. All it would take is one shot as opposed to 6 "little" random shouts from an "assault" weapon.