I too had problems with the hole spacing/alignment on my 110 flatback. After setting it (receiver) up in the milling machine, the centerline of the holes was off approximately .015" and the hole spacing by about .040". I redrilled the holes for 8-40 screws. After redrilling the holes, I proceeded to bed the base (EGW) with JB Weld, because the rear receiver bridge was about .015"lower than the front ring, which also had a forward slope to it. After all was said and done, scope alignment was not a problem. Hope this helps.