My P4Xi resides in Steiner T-Series rings that were a promo item with the scope when I picked it up. They are a pretty decent set of rings. If not the T-Series, I would’ve probably gone with Seekins or Badger for the P4Xi. With that said, everything else has a Spuhr ISMS cradling it. I certainly prefer Spuhr but wouldn’t hesitate to use the others.