I would look to Numrich gun parts corp.They may be found on the web.
Between 300-450 dollars in the condition that you describe.
These Winchester single barrel shotguns are selling for between 75-150 dollars.
No.
A barrel with a full choke.
Your Winchester model 12 shotgun with a original finish ranging between 60%-90%,will be valued between 275-475 dollars.
Your Winchester model 12 shotgun which was made in 1919 should bring between 250-350 dollars for a gun that is well used.
Modified choke with the 28" barrel.
* Full ** Modified *** Improved Stamped on the Barrel.
10-600 usd
Not recommended.
Yes, You can change the barrel. I would suggest sending it to Briley or another reputable choke tube manufacturer to have it changed to the briley or win choke removable choke tube. You can also purchase a rifle sight, slug barrle for under $250.00 from most retailors
NOW THERE SELLING FOR $250 MAX