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I have only had non tube style, and have seen/experienced poi shift/change. I believe it is firmware related(how the reticle position is saved). I also don't think the manufacturer(s) know the accuracy/repeatability of weapons/ammo some shooters/customers are using. So when a customer complains about a zero shift the company techs have no explanation. Perhaps their testing is mostly simulated, not actually mounted/firing on the range.