Try your local gunsmith. The Riverside is a Stevens shotgun. If you can find out which model it is, you can probably find the wood at Numrich Gunparts
Riverside Arms Chicopee Falls Massus. (569HF
Try Numrich arms @ www.e-gunparts.com
Riverside Arms was a name used by J, Stevens Arms and Tool Co (which became part of Savage Firearms) between 1915 and 1940. There are no public records for dates of manufacture.
yes i own one, ans am currently trying to find a diagram of the firing mech.
Riverside Arms is a brand name used by the J Stevens Arms Co. on many good quality shotguns. The value depends on model, gauge, and condition. There is little collector interest in single barrel shotguns. Information about J Stevens Arms apply to Riverside Arms Co.
Riverside was manufactured by Stevens, so if you can identify the equivalent Stevens model, you should be able to find parts. Check with a local gunsmith.
It is a Stevens gun, general utility type shotgun. Value around $200 in good condition. sales@countrygunsmith.net
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.
the internet
Gun Broker, Auction Arms, American Arms
You can find information on a Riverside Arms Model 520 pump shotgun by checking firearms reference books, online gun forums, and websites dedicated to firearms history and collectors. Additionally, visiting sites like GunBroker or ArmsList may provide listings and discussions about the model. You might also find useful information on YouTube, where enthusiasts often post reviews and details about vintage shotguns. For historical and technical details, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) may have resources as well.