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They are not, that is the button for decocking the striker.

Hi Ricky, it is not optics ready. What looks like an optics cover plate is actually a decocking button. Press the decocker downwards into the slide until the striker is audibly and visually de-cocked. Stay safe & have a great day!

Hi Ricky and welcome. It is not factory ready as you assumed. Cheers and stay safe! You can replace the rear sight with the dovetail mounting plate of the optics footprint you want: https://www.mountsplus.com/walther-p99-red-dot-mount.html