Try e-gunparts.com There's a whole list of places on the Remington Society of America here: http://remingtonsociety.com/rsa/service
Check this page on the Remington Society of America for a list of places: http://remingtonsociety.com/rsa/service
NUMRICH GUN PARTS SELLS THEM ON THEIR WEB SITE
Check this list on the Remington Society of America: http://remingtonsociety.com/rsa/service
The Remington Society of America has a services/parts link too but e-gunparts.com is a good place to start.
Not marked, Model 9
1920
Remington Model 12 barrels are threaded to the action. Barrels can be replaced with the proper equipment.
stocks are the same for any model 12 or 121, try e-gunparts.com or watch on gunbroker.com. There are people making them new as well for example http://macongunstocks.net/remington_model_12_or_121_2_piece_riflestock_96.html http://www.gunstocksinc.com/web_pages/Plate-pics/Remington-Stocks/Remington-Rifle-stocks.htm You can also try e-bay. Keyword Remington Model 12 and see what you might find.
Model R-12
Try Remington's web site. Go to remington.com and order one, they are free for most guns.
Numrich gun parts. Numrich has a nice exploded view of the SPT 58 & parts list.
We have parts for that model. sales@countrygunsmith.net