The 590 is more shotgun than anyone is ever likely to need it to be. Maybe I'm wrong, but I don't know why anybody would say that the 590 isn't fit for defensive use. I'm pretty sure the military would be very well served by the 590. The A1 is overkill for the sake of overkill. I would happily take an A1, but the 590 is a beast, as is the 500.