I have a friend w/ both a PMR30 and CMR30. Can't remember which one he got first but liked it so much he bought the other. I've shot them both a couple years back. He had said they were reliable and had no hickups when we were all shooting them. They were fun but 22mag is a little pricy for what it is.
I have the PMR and it has taken work to get it from "jamamatic" to occasional FTF. You will have to replace feed ramp and Mag spring. MCarbo has the parts. As long as I don't load Mags over 20 rds, it will shoot very well. I really enjoy it, for a little plastic pistol, the trigger is very good and it is accurate. Fun little Blaster , But as stated 22 WMR cost more than 9MM, if you want a Carbine go the 9mm direction.