Two out of Three ain't bad
I bought this to fit on my Williams peep sight, I had lost mine while hunting. I had a large opening from another rifle that I was switching back and forth. I really wanted the medium opening but when the pack arrived the small and large opening fit with no problems, the medium opening sight was very tight, too tight and didn't fit anywhere as easily as the other two. I didn't want to damage the base so I just used the large one again. I am disappointed as I really wanted the middle opening, but it doesn't seem worth the time and effort to send them back just because one didn't fit.
