I had the same issue with a repro scope and bracket. With a Weaver K4 in the bracket, no problems at at all. I then got a repro scope and the trouble started. Ended up being the relief cut for the scope locating pin was bad. Like mentioned before, either remove the pin or remove enough metal on the bracket to where the scope fits properly level without the upper rings. Once it lies properly in the bottom bracket, attach the tops.

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