Other than the issue with pdd614's scope, I'm only aware of one other scope that had a problem. A friend of mine has a KAC SR-25 and mounted a PRH 3-15x50mm using the KAC one-piece base. I had to machine the web on the base to clear the scope, but shortly after he began using it, the parallax knob started to work erratically. He sent the scope back and Premier said that it was a known issue (related to ring spacing) and made the necessary updates to the scope which has been fine ever since. He bought another PRH after that so it didn't seem to bother him.
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