I believe that there’s a sporting variant and a field variant. The sporting guns dent have longer barrels and are heavier. I would get one with removable chokes vs. fixed choked. And then the side plates have different designs. SP 1 has a scroll pattern and SP 3 has a game scene. I’d imagine you can get different grades of wood sets too. I like the 28” barrel. And you can get the stock cast for left or right handed shooting.