Tons of them on EBAY right now, standard large ring Mauser 98 bolt. The EBAY ones have the bolt turned down for a scope which is what you need. The Model 50 Rifle was made by FN on their 300 deluxe action. It is worth the bolt fitting. They are a premium rifle. I have a Model 270 and love it. The same basic action was used by Weatherby in the early 50's. IMPORTANT! It will have to be fitted by a gun smith for safety, headspace etc can and probably will be off. Do not insert and fire a round until a gunsmith checks it. DA.
You can try Numrich gun parts, ( e-gunparts.com )
It will not be easy to find a manual for a JCS Higgins 20 gauge bolt action model 583.15 shotgun. The company, JC Higgins is no longer around and has been replaced by the company, Ted Williams. The company, Ted Williams may be able to help someone find a similar model manual.
Gun Parts Corp has correct Higgins buttplates, but they would have to be fitted to the stock.
Made by Savage for Sears.
I HAVE A MODEL 20 12GA BUT NO BOLT, VERY GOOD SHAPE, SELL ME YOUR BOLT OR YOU CAN BUY MY STOCK AND BARREL VERY GOOD SHAPE.
You can't find them. What you can do is offer to buy my whole rifle which has a good bolt in it. I'll take a newer Marlin 981t as trade. email@example.com
Depending on which model, we probably have it. firstname.lastname@example.org
There were two types of firing pin used on that model. Would need to see the bolt, but we have the pin. email@example.com
find a collector i sold my sears and roebuck for 750 im sure you can get quite a bit.
Gander mountain usually has them.
That should be a Marlin 100 made with the Sears name. You cuold try Numrich Gunparts at the link to the right >>>>