I would scope it. Scopes take care of one of the big issues with hunting rifles, i.e. many hunters don't shoot their hunting rifles enough to get proficient with it and be natural using sights. A scope puts the crosshairs and the image on the same focal plane so all you have to do is put the crosshairs where you want the hole and press the trigger, instead of focus on the front sight, find the animal, oh, wait, yeah, no, find the front sight, oh just pull the trigger and hope. So, yes, scope.
I will assume, since you are talking about a pump rifle, that you are in the Eastern part of the country. I will also assume that most shots that present themselves will be 50-150 yds. So I can also assume that a 2-7X scope will fit the bill nicely. You choose the maker, I don't want to assume too much.