The military has had plenty of problems with them as well. Having seen them side by side, I think the Armalite AR10 is the better platform, and certainly has better support. Then factor in the price (!!!), and it's a no-brainer.
For the price of the Knights, you can have a pair of custom AR10s made that outshoot them, and have money left over for magazines. Oh, about those; if you thought AR10 mags were expensive, have you priced the Stoner mags?
-Troy