The Firing Pin & safety were redesigned
The firing pin and safety was redesigned in the Mark II version of the P85. It should be stamped Mark II on the safety and if not, give Ruger a call. They'll happily retrofit your P85 for free.
Why have it done? Under certain conditions, the old one allowed for unintentional discharge. The newer one avoids this altogether.
When I sent mine in, I knew which parts were to be replaced so I removed the firing pin and the safety myself. Nice to have some old parts just for show & tell (& comparison).