I am looking for a Williams peep sight for my Blue Streak. Williams 5C SH. I believe a Williams 64 from Pyramyd Air will also work.
Call Williams. (800) 530-9028
Williams is out of stock. They may or may not make a production run in 3 or 4 months. They are busy with OEM work for Ruger and S & W. My best option is to find one from a private party or a gunshop.
For sure recommended. Like any peep sight it nearly doubles the sighting radius from the stock open sight. I had a scope on mine for a time, but it hung right where I wanted to put my left hand to pump the thing.
The receiver sight certainly makes hitting with the Sheridan much easier....
At one time I used to use the Sheridan barrel mount with a Bushnell Phantom 2.5X pistol scope. It was light weight and out of the way so as not to effect pumping....
Bob