The CCI CB Long and the CCI Quiet are both REAL quiet, and will kill a squirrel at 25 yards or so. The Aguilla Colibri is also extremely quiet, but has less OOMPH! than the CCI stuff. They will ALL have a different point of impact from regular 22LR ammo.
The CCI will cycle through MOST bolt actions, lever actions and pumps. The only semi I have ever had that DOES cycle the CCI CB longs semi-auto is a Remington 550-1. I have a few of them- they have a floating chamber, and you can mix shorts and LRs in the magazine.
What we have here is... failure- to communicate.