I had no idea they existed either until I saw them listed in the 3rd Standard Catalog. I used to search high and low for one for years to shoot the off duty matchs I was shooting the 6906 compact in. Thought the added weight and better grip would be awesome. Just never found one. Lots of the SSV 5903 variant, just not the PC version.
Back when I had more PC autos ( all the wifes competition guns) I found you could switch slides on the service type models and they worked fine. But all the switches that worked had something in common. Either the slide came from a well used gun and would fit on a newer frame or the frame of a well used gun would accept a newer slide. So as long as there was some wear they would switch . Tried new slide switched onto a new frame and only had one swap that went on, but tight. So these guns do have slide/frame that are mated and fit at the time they were made. No new news there.
Back when I had more PC autos ( all the wifes competition guns) I found you could switch slides on the service type models and they worked fine. But all the switches that worked had something in common. Either the slide came from a well used gun and would fit on a newer frame or the frame of a well used gun would accept a newer slide. So as long as there was some wear they would switch . Tried new slide switched onto a new frame and only had one swap that went on, but tight. So these guns do have slide/frame that are mated and fit at the time they were made. No new news there.
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