The barrels are threaded into the receiver and not meant to be replaced by the average hunter. You would need to fabricate a barrel vise and receiver wrench to separate the two pieces. Also the barrels come in two different thread pitches 1' and 1.05" so be sure of what you have before purchasing. Unless it's broken, leave it alone.
They came in various barrel lengths and choke combinations. If it is not marked on the side of the barrel, you will have to pattern the shotgun to determine the choke
Try Numrich gun parts corp.or gun broker.com under shotgun parts.
I believe that this series of shotgun was made starting in the 1990,s and made up to about 2005.
it was made in or around 1972
this was made either 1988 or 1989.
Just sold one for $750.00/ like new
Blue Book of Gun Values will help.
If the owner's manual doesn't have instructions, seek out a qualified gun smith.
I believe it was Stevens
Pull down on forearm. It should come off. Then break open shotgun, barrels should hinge off.
I Have Seen them at Gun Shows In Michigan For About $ 100.00 To $120.00 . AND THATS In fair Shape . How Many do you have ? bobbybank1958@yahoo.com
$ 300-$500 if it is Police model with 18" Barrel, in good shape...I got one...