Numrich shows this part as available.
Part key # 30
Product # 474140A
$ 10. 55
Here is a link to the schematic for your shotgun.
When you get the schematic showing, the part you need is on page 6.
I would call them, rather than order online.
They have always been very helpful to me, and it's nice to know you are ordering the right parts.
Have your serial # handy when you call, in case there were possibly some changes in the part over its production life.