I had a 4-16x42 ATACR with Mil-XT reticle, and had a similar thought regarding cluttered center. I’ve got a 4-20 with MPCT2 now. The only thing the ATACR is better at is being a few ounces lighter. I think the ATACR is a good overall package, so don't take this as me crapping on it. Specific to the center dot, if you can't get behind a ZCO, the center dot is the same size as the SKMR/SKMR3, which seem to be easier to find even at sporting good stores. The dot is quite hard for me to see on very low mag, but around 6x-8x I can pick-it up, and around 10x-12x you'd have to have pretty bad eyes to miss it.