WHAT DOES RM66 MEAN?

The RM66 was precise. I did notice that my groups tended to get strung a bit vertically. I feel that was thanks to a Smith & Wesson bias, as I'm accustomed to white outline rear sights with crimson insert entrance ramps. The RM66 has a white outline rear sight, nevertheless the front ramp is black. With much more taking pictures I’ll get used to