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.
My other auto is a .45
The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory
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
If you can not deal with reality, reality will deal with you....