I "settled" on an older Williams FP sight. I did add the target knobs though.
Ughh!
Looks like they had to file a grove in the stock of the gun to make the sight fit.
That is the problem with those Williams sights. I've seen a lot of 99's with Williams sights on them that look just like that.
Why did they make a sight that wouldn't fit the stock of the gun they were making it for? I could never figure that one out.