Hello, I am trying to determine if this receiver was drilled/tapped for these Redfield mounts. I don't see any screws on the mounts and I can't tell how these mounts are connected to the receiver. I believe that these mounts might be compression fitted, but want to be sure. The seller believes that these mounts didn't require tapping/drilling. I am inexperienced with mounting scopes and I have a return window of a few days from now. Do I need to bite the bullet and remove these mounts myself to be sure that there aren't any hidden drill holes? And are they difficult to remove and put them back on? I have spare Sako rings as alternates. These mounts seem to be a good match for the scope clearance. Thanks in advance.