I've had Rimfire Target Concersion Kits from Kimber and Ciener. I had trouble with the Ciener kit not fitting properly and thanks to that learned that their customer service is horrible. It of course was my fault and so on - and that was after I was finally able to speak with someone. Call their number once and you'll see what I mean. Fortunately, I was able to return the kit to the place where I bought it.
The gun I was trying to convert was a Kimber Stainless Gold Match so I bought a Kimber Rimfire Target Conversion Kit from MidwayUSA. It malfunctioned more than not so I sent it to Kimber who returned it with a no-charge invoice saying they "replaced small parts." It still wouldn't function right so I sent it back again but this time on my frame. Again, no improvement even though they replaced my gun's mainspring housing.
Finally, I asked for an exchange and was granted one. I took that kit on that gun to my club with a box of their recommended ammo, which I had been using all along, and out of 100 rounds, 74 failed to feed, failed to fire, failed to extract or failed to eject! MidwayUSA was gracious enough to give me store credit when I enclosed all the Kimber service paperwork with the kit when I returned it.
I then bought an Advantage Arms Rimfire Target Conversion Kit and it has been absolutely flawless on that Kimber frame as well as two of my S&W 1911s. Soon thereafter, two fellow club members joined me at our 25-yard range with new Kimber kits ond experienced the same level of frustration that I had.
The Advantage Arms kit is a clone of the more costly Marvel kit and has all of that kit's features including locking the slide back on an empty magazine, something that not many other kits do.
Good luck with your Ciener! I hope you never have to try to contact them.
Ed