I put one of the early glass versions of the RMSc on my Hellcat. Plate not necessary on Hellcat. Be aware, for my sight, the optic was an extremely tight fit when tightening down... It would not actually fit perfectly flush with the slide cut. I called Shield about that, and they claimed Springfield did not cut/mill to spec. Whoever is to blame, it may have changed by now, I just don't know.