Take it from one who loves multiple-purpose things: Shopsmith, Swiss Army knife, Valmet multiple barrel guns, and several double guns with two sets of barrels. All three of my two barrels sets are older and have different length barrels with different chokes. I only used one barrel in each set. Don't waste your money. Get a fairly long barrel (I have come to prefer 28") because you'll hit better with it, and go the choke tube route. You won't use the second barrel enough to justify the cost. An extra set of barrels is only truly useful if it is a different configuration, such as double rifle or combo gun.
