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Not up on the early models but is the front ting drilled from the factory? Is the barrel drilled for a scope block? If not then what would be the reason for only drilling the front ring?

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All pre-War Model 70's were drilled for scope mounts only on the front ring. Some barrels were drilled for target scope blocks. Magnum actions had a portion of the receiver bridge machined away to allow for loading the longer cartridges and some bridge mounts had provision for only one screw into the bridge. Some mounts used the holes intended for a receiver sight to fasten the rear mount to.

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