Where can bolt parts be found for a Western Field Model 36B single shot rifle?

A Western field model 36B was made by mossberg.The mossberg firm actually made 2 models that was designated western field model 36B.One was the mossberg model 25A,and the other was the mossberg model 10.These are the models that you would at for parts to your westernfield model 36B.I would start my search at Numrich gun parts corp.They may be found on the web.