I have 20 gauge 3" barrels to match my Krieghoff O/U .458, and they got a lot of use in Africa. Were I to order a set today, I think I would want choke tubes installed to get maximum use out of them.

I assume your DR is to have double triggers. If so, and you are not used to using them, the shotgun barrels provide a perfect tool for inexpensive practice, both on clays and in the hunting field.