Good evening deerhunter,
In reference to black coatings on the R9, we used a company named H&M Blacknitride+ for all stainless parts coated black. Very nice people to work with and the layer is thin and robust. We never had to worry about thick with them, as you do with Ceracoat. We tried Ceracoat once for the desert storm tan R9s we made. I personally did the coating in-house and was not a fan of it as each slide had added thickness causing me to hand-lap each slide to the assigned frame. We didn't make many Coyote models due to the extra work involved. Anyway, I'm sorry to say I'm not up on the new coatings offered today so, unfortunately, I can't help out with those. All I can say is that when we would call them, Shade McMillian was always pleasant and extremely helpful.
I hope this little bit of information can help in your choice of treatment for the slide.
Have a great weekend!
Regards,
Eric C. Rohrbaugh