stevens bolt action 22 model 840
I have quite a few Savage/Stevens parts. firstname.lastname@example.org
You can find most of the parts at e-gunparts, to find them do a google search of "e-gunparts".
Try Gun Parts Corp (Numrich) or Jack First.
Your gun is a Savage/Stevens Model 86. gunpartscorp.com has some parts. After that it is a long search.
J Stevens Arms Company has been making rifles since the 1890s. There are dozens of different models of Stevens bolt action .22s. If you repost with all markings on your rifle, we make be able to narrow it down a bit. sorry-
Try Gun Parts Corp. They have a web site
The stevens model 15 was made from 1936 until 1971.