As you can see from the pics the new YHM BUIS does fit under the TA31F ACOG mounted on a ARMS 19S with the ghost ring selected as the default aperture, it clears just barely.
I was questioned about whether it would fit with either aperture selected on the YHM BUIS and I thought I'd post the results here.
The YHM also allows the AMRS mount to be placed as far rearward as possible.
I'm still waiting on the new Troy BUIS, but I have to say I'm very pleased with the YHM.