Scope moving post brake installation. Reputable fellows recommended Burris Signature rings. Picked up a set of High Sigs this evening. Was quite apprehensive about the "plastic" inserts. This is my first experience outside of the Redfield/Leupold scope mounting world. Also what's the deal with offset inserts. Burris says ya don't need the 20 moa base??? Sorry to be a bother but the learning curve is a bit steep when one jumps into the medium bore world and is pushing the envelope a bit. Thanks.