Don’t know much about these, but I pulled the trigger and bought one. For $90, it’s worth a try.
http://www.primaryarms.com/cmc-ar-15-ar10-lantac-e-ct1-single-stage-upgrade-trigger-flat-91513
http://www.primaryarms.com/cmc-ar-15-ar10-lantac-e-ct1-single-stage-upgrade-trigger-flat-91513