I would think the type of barrels would be the deciding factor. For example the Hollywood gun is a vent rib and BTF 2 bbl set. An extra set of vent rib bbls would be hard to find. Also does the second set have a forarm, are they extractor or ejector, small bore, length ect all determine the added value.
I recently sold a GH 16 0 frame damascuss with an added set of damascuss 20ga bbls with their own forarm. I know the person I bought the gun for paid an extra $2K for the second set of 20ga bbls.
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