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There is a .50 replacement barrel on Gunbroker.com
$100
A replacement barrel for a J. Stevens Arms C20-A shotgun can be found at a local gun/firearms store. If the replacement barrel is not available on site, ask if the store can order it for you.
Dicks sporting
Try the gunpartscorp.com
The original factory barrel will have the name Winchester and the chambering of the gun stamped into it.The color is another tell, the color on the chamber should match the barrel exactly.Look at the joint between the barrel and the chamber, can you see any bare metal at the end of the barrel?A replacement will have to have had the threaded end of the barrel milled after it was blued to get it to fit right.
You can use the N-strike Recon CS-6 barrel (good gun, I recommend it)
either is fine
was imported into canada by the decatur,bull comany in qubec unknown belgium maker
50-500 uSD
This trade name was sold by H&D Folsom Sporting Goods of New York. From 1893 until 1930 they would have been manufactured by Crescent Firearms of Norwich, CT. Earlier guns would have been imported from Belgium.
From SAAB., Your nearest dealer can get a key to match your barrel.