Not to be a stick in the mud but for CZs they are all good, Canik is another story....
21.6 Exchange of minor EXTERNAL components
•Externally-visible parts from “custom shop”
guns will only be considered “OFM parts” if
the custom-shop gun is on the NROI list of
approved Production guns.
Please don't get me wrong, I would love to have a new hammer for my P-120. I'm pretty sure they were assuming the question was in regards to a more 'mainstream' model such as a CZ or Tanfo that has custom shop support strong enough to market and sell the volume to make the production list.
Again, I may be way off here and truthfully, would love to be in this case.