Hmm, i wouldn't bet totally on that.
Many manufactorors have FA carriers in their guns, i think it was more of an import issue for the 9X series to not have a FA carriers (even tho it was legal).
I would bet that the upper on the 416's and 417's will be the same they provide to LEO and military. The more ability to standardise = cost savings.
Of course, there IS a possibility HK could make S/A carriers, but it would seem pointless with all the people with RR's and RDIAS'. Course when we actually understand HK's intent to do something, i think we'll be in a better place