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yes i own one, ans am currently trying to find a diagram of the firing mech.
the internet
Gun Broker, Auction Arms, American Arms
On the but
Try e-gunparts.com
No public records
Try e-gunparts.com. Cost will exceed the value of the weapon.
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
Auction sites, Shotgun News, gun shows, gun shops
Try e-gunparts.com
Try Numrich Arms
it is a Stevens, parts are interchangeable...