I agree. If they did a 280AI I would buy another one.
I have owned a Longmaster, and it was very accurate (it still is, but my son has it now). BTW, they are still available, but just a little rare.
The Longmaster weighs about 5 oz. more than the Open Country.
The Barrel on the Open Country is quite a bit heavier (.860 at the muzzle), and the flutes are much deeper.
It is shocking when you handle the Open Country. You're prepared for a heavy slug, and it feels so light at 7lbs.