What value for a Winchester 20 gauge 120 Ranger Model120 with a ribbed barrel?
your Winchester model 120 ranger shotgun is worth between 90-150 dollars,depending on overall condition.
What is the book value of a Winchester model 12 manufactured in 1926 with a modified choke in very good condition?
The question is a little confusing to me, is this a 12 guage gun or is it one of the Browning reproductions of the Winchester Model 12. If the barrel is available it is usually a simple process to replace the barrel on most pump and semi-auto shotguns. If you are talking about a break open type shotgun (over & under, side by side, or single shot) that is usually a very expensive process.