I can’t speak from experience but I’ve been to many PRS rimfire matches and seen a great variety of guns but have never seen an X ring. I have seen a lot of different platform semi automatic 22 rimfires and almost all are either modified Rugers or Dlask variants with every barrel,trigger combo. I don’t see any on the 1/2” challenge that are X ring but that doesn’t mean they are not a quality gun. I wish I could tell you more. I don’t think you will go wrong with a Dlask with good quality barrel and trigger. I have (assembled) built a number with Dlask receivers and parts both Dlask and Kidd. All have Kidd triggers and all have turned out extremely accurate. I have two that rival my Vudoo as far as accuracy. One in 22lr and one in 17 Mach2. Don’t know if this has helped or not!