I must have a different CS9. I have a 908 with a plastic guide rod, disconnector and rear sight and the CS9 has none of those. Also, the CS9 slide is the same shape as the 3913, not the blockier 908 shape. My CS9 doesn't have the grip checkering normally found on the 39xx series.

The CS9 *may* be the value line, but I see more in common with a 39xx than a 908.