you can get that mount at mid way
Try these sources: Numerich gunpartscorp.comJack First jackfirstgun.comBob's Gun Shop gun-parts.com
List all the markings that ARE on the rifle. sales@countrygunsmith.net
If your Stevens is a bolt action, it is NOT a visible loader. If it has any part (perhaps the barrel) that is marked as a visible loader, that part has been replaced.
try gunbroker.com they might have parts
You can find most of the parts at e-gunparts, to find them do a google search of "e-gunparts".
There is 1 on gunbroker.comStevens Mod 39A / 59 A,B,C .410 shotgun bolt Auction # 147552744
Mossberg or Savage/Stevens? Any particular model? sales@countrygunsmith.net
Do a google search for "e-gunparts", they will have most parts.
The patent date should be just in from of the bolt under the rear sight. But only if it is a bolt action!!!!
I can't find a Stevens 851 listed in the Blue Book or Standard Catalog. To find out more, see if you can get all the markings on the gun and consider the action (single shot, double barrel, bolt action, etc).
"this is a lever actun not a bolt" Incorrect. The Stevens Model 58C 410 Shotgun is a bolt action. I think that the store at the following link has magazines in stock: http://www.gunpartscorp.com/Manufacturers/SavageStevensSpringfieldFox-33479/Shotguns-40503/58Series-41363/58C-34126.htm?page=2