Not sure how tough they are but… - FAB Defense Top Mounted Deployable Front and Rear Set of Flip-up Sights

Not sure how tough they are but… Accurate and I like the fact they don’t pop up. They are silent as you push them into position. In a combat situation it may or may not matter. But if you’re trying to be stealthy a loud pop as you engage other brands could give your location away. These slide up with little effort and are almost silent.