the '52's were not drilled and tapped from the factory for scope mounts. The 1952 was designed "to accept any side mount with a minimum of work" according to Stoeger. Steyr offered a swing mount as well as our domestic ones by Leupold, Pachmayr, Griffin & Howe. I think the Redfield mounts were the best of the USA makes. There is a guy on GunBroker who used to sell reproduction Redfield mounts which were as good as the originals. Not sure if he still does. D&T'ing will lower the value to collectors. I have two '52's one D&T'ed (bought it that way)the other original.