Send me your email & I'll send you a scan of the diagram. USDF
You can locate a schematic at http://www.remington.com/pdfs/om/om_11001187.pdf.
See related links I put a pointer to e-gunparts.com for the model 16, the have many schematics there as well as the parts page online.
A darn good site. http://www.urban-armory.com/diagrams/rem514.htm
on classic fire arms llc
I am not sure about the diagram,but I would check at numrich gun parts corp. first for the parts you need.
The model 31 was made from 31-49 so the barrel is date codes stamped, I add related links which has a page on the Remington Society of America with a diagram and the table.
Check Remington Society of America Service/Link page: http://remingtonsociety.com/rsa/service
You can find a parts diagram on the CROSMAN homepage. Click on "Download a manual" (at the bottom of the page ) There you will find an owners manual and parts diagram for the model 66. Parts are still available through Crosman. See the related link.
Numrich gun parts corp.may have a exploded view of this model on there web site.
Send me an email. I have a few parts. Triggers, bolts magazines, and barrels. Papawlambert@starband.net
Check this page on the Remington Society of America for a list of places: http://remingtonsociety.com/rsa/service