joglee on AR15.com obtained some information regarding IAR trial through FOIA request.
https://www.ar15.com/forums/t_1_5/1973567_FOIA-Results--Infantry-Automatic-Rifle--Colt-as-reliable-as-HandK-.html
The evaluation criteria and evaluation procedure was lined out and the result as well.
An interesting point shows up.
Class I and II failure numbers show that one of Colt actually did quite well, beating H&K's proposal. The best result was from Competitor F.