Sorry, but you won't.
Try e.gunparts.com
You might find what you need at webdept@gunpartscorp.com .
28 gauge with single barrel How do you find its age and value?
http://www.e-gunparts.com
A REAL good description! Including pump, hammer, auto, single, double, gauge, serial, writing, etc.
Check the on line auction sites to see what they are bringing.
It is a Stevens 940B. I have the schematic. sales@countrygunsmith.net
i am not 100 percent sure but i think it would be found on the barrel.
I have this model gun however i know very little about it. EBAY e-gunparts.com is an awesome parts site
gunpartscorp website has a cross reference to find the originial make and model, and usually his firing pins.
Should be a single-shot made by Savage/Stevens. We have new reproduction stocks. www.countrygunsmith.net