What seems to be the current going price for a 20 gauge ICD grade 4 in about 95% condition? The only wear on the metal is on the trigger guard tang and there are some very minor marks on the wood. DT, 30" barrels.

What would the addition to the value of the gun be with a set of Galazan's 28 gauge barrels (also 30") fitted to the 20 gauge frame?

Thanks.