Orry, thank you for the suggestion.

Jimmy, I bought the barrels from CSM, sight unseen, for $500. Simple 26" 12 ga barrels choked IC/M. They wanted an additional $2000 to perform the work I outlined above if I understood correctly.

While it might have been easier to have them do the work, it seems as though I could get the work done more competively than at that price. Not looked for Grand American work here, just trying to add a second set to my duck gun to shoot skeet with.