As Doc1500 noted, it serves as a "loaded chamber indicator" that you can feel easily is flush when a round is in the chamber, out like in your photo when the chamber is empty. Nothing wrong with the part on your pistol.
I don't understand what you are describing as a silver pin in the extractor you saw on the gun at the LGS. I don't recall seeing any reports of changes to the extractor in any of the P-07/09 pistols. I don't think they would add any sort of pin to the extractor itself.
Joe