MM, did you alter the USMC backup sights on your KAC somehow to run a 100 meter zero?, or you just talking about running a 100 meter zero with the aimpoint, while running the 50/200 zero on your KAC BUIS??
My last training day, I ran a 300 round mix of ammo testing the KAC BUIS with the 50/200 zero. Ran drills from near point blank all the way out to 500, and it was the bomb. I prefer keeping the same 50/200 zero on the aimpoint mounted lower 1/3rd cw. But, there was at least one LMT SBR running the same drills using a 100 meter zero which did well, other than maybe some holdover issues at the longer ranges, but an SBR is not really designed to shoot that far anyway.
Best
