I have a CA. It uses a K front end and carrier. The recoil assembly is somewhere between a full size and a K. I find mine runs a little faster than my Vollmer converted 94, but I can still pull singles. Here in Las Vegas, I've found that factory 147 gr can go supersonic in my full size. With the 5.5" K barrel that has not been an issue with the CA gun. I certainly prefer running a can on it as opposed to running a can on a full size. With a can on a full size, I find it to be very muzzle heavy. The MK9K or Raptor on the CA gun is much less muzzle heavy. Good luck with your reverse stretch project.
Scott