Sorry to be so late in seeing your post. The Okie Gent who told you to check Ciener has obviously never owned an Advantage Arms Conversion kit (AACK).
Go to Glock Talk and run a search on "Ciener" or on "AACK." You will find VERY few people who don't consider the Ciener to be a POS. You will find a multitude of people who will attest to the reliability of the AACK and will give a multitude of reasons why the AACK is better.
The AACK costs more - and they are selling faster than the factory can make them. Guess why.
If you have already made the mistake of buying the Ciener, I hope it does well. Because if it doesn't, you are SOL with Ciener's "customer service" (it is non existent).
Good Luck,
Dawg23