I installed a Holosun EPS on my P10C OR tonight. I noticed when I test fit the plate in the cut out, it would rock slightly. On closer inspection, I noticed the extractor retaining pin was protruding slightly above the slide cutout.
A few taps with hammer and punch seated it nicely. The plate then sat flush on the slide.
FWIW, it's something to be aware of if you're looking to mount optics on your P10.
