It comes down to the individual gun. I have two 442PC models, the version produced for a Chattanooga arms dealer. While PC models, supposedly of a higher quality, I will not carry either for SD. They were apparently put together in a slipshod manner with the sideplates being improperly screwed down. As a result, the cylinders would rotate, but the hammer would not cycle to strike the primer. Unacceptable for a SD gun. I tightened the sideplate and the guns would fire. Also, the grips were of poor quality. The PC added some silvery parts from an earlier model: trigger, ejector latch but these do not balance out the failures to fire due to poor assembly.
That said, I have a number of 642 'sister' guns which all work well. Again, the individual gun...
Kaaskop49
Shield #5103