CZBUFF,
I called them on Jan 24, 2005. There is a an earlier thread on this a couple of pages back where I got help from the group here when this problem occurred for me. Williams replaced the 1/8" high rear site base that came with the sight (that dovetails into the rear rib mount) with a 5/16" high one free of charge. It said 5/16" on the packing slip but I cannot find it now to give you the part number. I may have tossed it. Note that it may be an interchangeable part from another sight they sell. If I find the slip, I will post the part number. Tell them they did it for a guy in Woodstock Georgia who called on Jan 24,2005. I know they keep records of their parts ordering because when I followed up, they were able to pull up the request. I do not remember who I spoke to except being a guy in the late afternoon and he was very familiar with the sights. He had 2 different bases he could send me and I asked him for the highest one. Sorry to here of your difficulty with Williams. The higher rear sight has worked. I also suggest you burnish the bore as recommended in this forum.
Probably need to recommend to everybody that the vendor custom order the sight with 5/16" rear sight base from Williams rather than ship stock. Let us know if Williams resolves the problem. My 2 calls to them, one for for a bad clamp and the other for a higher base were good. Hopefully you got somebody misinformed and this is not a change in customer policy.