Is the current LOP the correct length for you to shoot? Have you shot it for POI?
If the LOP and POI are OK, leave as is unless you want to find someone to do a better match for the replacement. There are also people who can do stock graining to do a better match with the replacement.
A Duck built for stock is choked FULL/FULL at 35 thousands constriction which is good for pass shooting or Trap. the LOP of a built for stock Duck was 13&5/8" to accommodate heavy clothing.
A VR 'Duck' in Pristine condition is usually worth in excess of $6K. Is it stamped 'Duck' on the floorplate and do you have a Cody letter signifying an original VR gun. There were after market VR's available and they do come loose in my experience.
Be very sure of the specs of this gun before purchasing. Good luck.-Dick
