Most airsoft guns pattern their sights after the real thing, and they're graduated the same so that you really CAN set it to 800 meters or some ridiculously optimistic distance. The reality is you'll have difficulty getting your BB much further than 100 meters at the most, and even that's pushing it. Beyond that the ballistics of a 0.2g plastic sphere travelling at less than half the speed of sound just aren't there.
To answer your question, I've never had to adjust my airsoft guns' (plural) sights.
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