After looking at the H&R web site I would chose The 12 Ga., 24" Turkey, Extra-Full or 12 Ga., 28" Turkey, Extra-Full. Barrel length will make little difference on performance. I think either barrel will work great with the extra full choke they supply. And for $60 bucks you can't beat the price, compared to buying a whole new gun. Good luck, and keep us posted on how the new barrel performs. Keep the questions coming, and by the way welcome to the roost.