Yes
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.
More information needed.
They became expert marksmen with their long barrel muskets
The Stevens will accept whatever caliber designation is stamped on the side of the barrel.
Yes in 1860 Stevens made a double barrel, all steel barrel and its has external hammers.
Try Numrich gunpartscorp.com Jack First jackfirstgun.com Bob's Gun Shop gun-parts.com
There is a .50 replacement barrel on Gunbroker.com
It depends on the Manufacturer, model, and series. I don't see why you couldn't change the barrel size if you find the barrels the same as the 20 inch models. A gunsmith should verify that the headspace is correct with the replacement barrel. The barrel length isn't the concern - it is the fit at the breech that might be off. If there is too much clearance between the end of the barrel and the standing breech, you might be unpleasantly suprised.
The Stevens double barrel shotgun is worth $350 to $450 dollars. The value is determined by the gun's mechanical condition.
The Stevens model 311 was discontinued in the year 1989.You would have to contact Savage/Stevens to get the actual age of your double barrel shotgun.
Where is serial number on stevens 311c 410?
If it is a typical Stevens double or single barrel there should be a metal lever towards the back of the stock slide it left or right and tilt the barrel down.