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Old 12-10-2012, 12:20 AM
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Probably depends on the mount you're using. I have no experience with the one you listed.

The LaRue mount I have on one of my AR uppers will return to zero, within a minute of angle. Once it was zeroed for the load I settled on, it was removed and reattached several times over the course of a few months, mainly for storage or transport of the upper. Always returned close enough to zero that I don't really notice it. Other factors like amount of barrel fouling, ambient temperature, barrel temperature, etc. will affect POI as well so it may be hard to isolate POI shift unless you run a test and try to minimize outside variables. This may be a waste of time with a red dot, which isn't going to give you precision anyways.
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