I never did update this post, sorry. I did some shooting at the range and found with the Williams fire sight being the same hight as the original, I had to take the riser out of the Bullseye rear to get in sighted in. But it works fine there. At 50 yards, she will shoot at about 2 1/2", and is 2" high. That 'should' put it right on at 100 yards but I have not shot it at 100 yet as I'd rather use a scoped rifle when the range stretches, that's just my eye problem, not the gun or caliber. I'll get a chance to play with it at extended ranges in a couple weeks at the shoot. But it does shoot very well at 50 yards, the sights are quick and easy to use! 44 Man