There used to be a Aimpoint Rep on Lightefighter who would start his demo by taking his AP off the rifle chunking it across the range reinstalling and shooting to prove zero. Bottom line is Aimpoints are pretty durable but not to say some can't be knocked off zero.
I'm a firm believer that the mounts are the weak point. I have a couple Primary Arms and Holosun optics on various rifles, any issue of losing zero has been fixed by replacing the factory mounts with quality ones.
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