Parts are no longer made for that model. Your best bet is one of the auction sites or http://www.e-gunparts.com/
yes it is a single barrell
100-300 USD
Without more of a description; 50-20000 USD
what is the value of a Hartford double barrell 12 gage shotgun with duel over head hammers great condition
Which model? Use the link below to find the manual of your particular model
Not marked, Model 9
No way to tell without more information.
Try a Mossberg Model 385K. This is what it was originally
I have a Marlin Firearms Co. 12 gage, bolt action shotgun.
http://www.gun-parts.com/index.html/
price of westport, 16 gage model 948e made by stevens ?
have a shotgun 16gage side by side sent home by my father from Germany in WWII the word geco on the side of the barrell can't find any info on value of gun or history