I have the PMR & had the chance to shoot the CMR yesterday. They shoot ok to 50 with a red dot. If you want precision a scope would be a better option. You'll have to experiment with what ammo it likes. Most 40gr fmjs should work good.
I also have the PMR. It's probably the gun I have the most fun shooting. I mulled over getting the CMR but never pulled the trigger. Keltec makes some cool stuff.