Can't be answered without knowing what it is choked.
stevens model 620
It depends on where you are. In most U.S. states, you can sell a shotgun on an individual to individual basis with no paperwork. In a few states, you have to go through a licensed dealer. You can also sell guns through various websites such as gunbroker.com
One can get spare parts for a Nikko shotgun at some local gun retailers or through gun manufacturers. Gun parts can also be found through gun classifieds and gun auctions.
Not recommended
Not recommended for full choke
being that your savage/stevens shotgun was made between 1933-1945,I would have a gunsmith check your shotgun to make sure it is safe to use and at that time question him on use of steel shot through your shotgun.
Savage-Stevens, early-mid 40's through 50s
stevens model 620
Contact Stevens Customer Service through their website
yes but steel shot will eventually ruined the barrel lead will not
You may be able to find the information you are looking for through this web site: http://www.huntingsociety.org/gunstocks.html
Try your local gunsmith, rummaging through the bins at a gun show to see if you can find a match.
What type of action? Ranger usually means it was sold through the Montgomery Wards catalog.
Check with Savage Firearms customer service through their website. They own the Stevens brand.
Riverside was manufactured by Stevens, so if you can identify the equivalent Stevens model, you should be able to find hammers at http://www.e-gunparts.com/ Or if you still have one hammer (or a broken one) you can take it to a local gunshow and dig through bins of miscellaneous parts looking for a match.
Utility gun, probably made in Belgium between 1890 and 1914, or by Crescent, Davenport, or Stevens between 1915 and 1940, and sold through Shapleigh Hardware.
If your shotgun has Damascus barrels,then by all means do not fire modern smokeless ammo through your shotgun.I would have your shotgun looked at by a qualified gunsmith before attempting to fire any ammo through a shotgun of this age.