NE450No2 - Thanks for that. I think you might be on to it. I did notice that the mount screws were not uniform in their depth & therefore the scope alignment would be off to the side. I am new to this type of mounts & decided to use them as they fit the rear bridge without have to grind off the flange. The stock seems to sit very well. The oil stains & action impressions are minor & there appears to be no stress.