It is the same as a Winchester model 141 and parts are available from Numrich gun parts
Try want ads, gun shows, e-gunparts.com, gun shops.
Numrich Gun Parts Corp. http://www.gunpartscorp.com/
gun shop, gun show, on line auction, pawn shop, want ad
All of the Sears Model 799.***** BB guns were made by Daisy air gun .You may want to contact them directly or search the web for an 'Air gun repair" shop to locate someone to repair the BB gun for you.
In sears
Gun Parts Corporation is the main supplier of Numrich gun parts. On eBay, one can find Numrich gun parts. On Amazon, one can find a few Numrich gun parts.
numrich gun parst e-gunparts.com this is a complet book on parts and prices.
Sears offers appliance parts from every product and brand. Individuals have many options when they shop at Sears for appliance parts. It is a recommended place to go for these parts.
it might also be a marlin, but try any local gun show
gun parts inc ny. nunrich arms The gun was made by Marlin (for Sears) and is a version of the Marlin Model 80. That should make it easier to find a stock. The reference above is for Gun Parts Corporation / Numrich Arms, whose website is www.e-gunparts.com sales@countrygunsmith.net
Talk to the company that made the gun. See if they have replacement parts on hand. I suggest you take the gun to a gun shop to have it identified. JC Higgins is just a brand name used by Sears. The guns and rifles were made by Mossberg, Savage, Remington and other gun companies. They put the JC Higgins name on the guns for Sears to sell. A good Gun shop will recognize who made the gun.