Meprolight MPO Pro-F and Meprolight MPO Pro-S closed emitter sights available.  Great optics! Auto/manual brightness adjustments, Three-segment Reticle,shake awake feature, NV compatable as well as IP67 waterproof. Pro-S is for a compact/sub compact with RMSc/Jpoint footprint and the pro-f is for a full size with an RMR footprint. Both lightly used still like new. I chose to go with the holosun that's made for Glock instead. $200  for the pro-s and $275 for the pro-f.