I've had three 21s one of which was a Duck gun. Nice guns that I think are pretty nifty in a lot of ways. Unfortunately I don't shoot well with a 21. I like a lighter gun. I traded mine off pretty quickly. Different strokes for different folks.

Don't shoot slugs or steel shot though those full choked barrels, you'll ruin a damned fine gun. The Duck gun will require that you either open the chokes or find a safe steel substitute, which is not easy. There are people here more knowledge then I that can advise you. If the gun will work for you, you'll love it. There seems to be no middle ground when it comes to the 21, folks either love them or don't care for them. The 21 is a worthy subject for this forum.