My Dad's old model 37 has one that brings the barrel to 24 inches in length. I think that the added weight of the polychoke makes it swing like a 26 or 28 incher. Don't care for the looks, but I love the way it points. As for the choke itself, no data to back me up but my impression is that with lead shot in small sizes, it's pretty much what it says it is. Not sure beyond that. I do know that #2 steel with the choke set on "Slug" was lethal on ducks.
