aimtech does show a mount for the ruger p89. all this mount does is replace the standard grip panel found on the pistol with no drilling or tapping. The 85 uses the same grips i believe as the 89. might want to contact iowagean or coffeepot to confirm but i think this will work as long as the slide/frame contours are similar. maybe you can contact aimtech to confirm. here is a place that has them along with a pic. Model APM-19
As far as a red dot, i like the bushnell holosight and the millet red dot. Recomend you stay away from the cheapies.
there is another mount system out there but i can't remember who it was but it was a reflex sight that fits into the rear sight dove tail. don't know much about those. as they are actually riding the slide and subject to the hammering instead of riding above the slide free from contact as in the aimtech design....
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