It was down selected in the CSASS along with with the Scar and Hk, Performance among the three rifles was more or less the same with the third phase being canceled due to user feedback from I believe Brag/Benning. Its been a while.
FWIW, they are both superb large frame gas precision rifles. We build M110 rifles and also the L129A from LMT. They use a lot of interchangeable parts. KAC seems to grab headlines, while LMT just does good old-fashioned great work with a Midwest sense of humbleness. I am pretty sure LMT was building parts for the KAC M110 program in the early 2000s, and there is some evidence that the building relationship also went the other way as well.