OP, with the choices you listed, I'd go KAC. If that's too much coin, go with the MBUS Pros. While the Troy BUIS are robust and a quality design, I generally stay away from their products for personal reasons.
I like MBUS Pros. Have a KAC micro rear and like it ok too
A friend recently bought a set of these
https://www.griffinarmament.com/category-s/1863.htm
And foot print is similar to the Pro or Micro. Time will tell on durability, but everything seemed well made and we'll thought out.
LWRC Shirmisher Sights! Won't have anything on my rifle that says TROY for personal reasons.
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