If he’s going to hunt waterfowl with steel, tungsten, Hevi-shot, he should have interchangeable choke tubes. I often use an improved choke for pass shooting in tighter quarters like cedar swamps, ponds, and rivers. I’ll second Sandcritter’s recommendation of an 870 as long as it has Remchokes. I wouldn’t worry about having the ability to shoot 3-1/2” shells. They’re largely unnecessary and ideally shot in an autoloader.
