I never did subscribe to the square range mentality. I only go to a public range to sight in new optics, even then I never sit on the chair or use the bench, it's prone on a shooting mat with the rifle resting on a pack. Square range shooting developes bad shooting habbits, and in this case as I suspect, influences a shooter's buying decision.
I attend classes about 6 or 7 times a year, all of them in sandy conditions with high rounds count. Last Saturday, in muddy and pouring rain. An EOTech developed a battery problem, the owner switched to 3 different sets of fresh ones before it decided to work again, other EOTechs worked ok. All ACOGs and Aimpoints came through with flying colors. Some problems with franken AR15s. One had let loose 3 rounds in full auto when the bolt carrier was released, another lower had pins walking out all the time. My own MRP ran well, due to the mud getting into the upper it was a bit harder to do a chamber check.
Anyway, I believe most, if not all of these shortcomings will either never surface or take a long time to show themselves in a square range, shooting off 200rds or so in a dry, shaded and comfortable environment (we shot well more than 1200 in one day). If your weapons are intended exclusively for the square range, then I guess you can buy your equipment accordingly
One of my friends' MRP
Mine with a thoroughly soaked TA31F