Yup, I had just realized that. That linear cam allows the sear to pop back up and catch the striker lug as the slide moves forward. You can even see that if you hold the trigger when you rack the slide from a non-cocked condition. Takes a good flashlight and some careful looking to see it. In my case, the CA version, you have to have a magazine in and release the slide while still holding the trigger. It's all very simple once you understand the process.

I was assuming that cam did something during backward movement when it is designed to do it's job during recovery.

Thanks for the help. You helped cap off the whole process.

Now for an afternoon nap.