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Originally Posted by Sindervhit
Well, as far as I know, Point of Aim (where you're looking) / Point of Impact (where you hit). Granted, I haven't used a whole lot of different optics (mainly the Aimpoint), but it just seems like simple math that if you change the height of where the optic sits then your point of impact will be different...so you would need to re-zero obviously. I think I was assuming that optics have an ideal height they should be at on the rifle. I could very well be wrong, I don't know the math of it all.
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Just making sure we were on the same sheet of music.
I'm not sure what you are getting at but if you sit an optic or iron sight on an upper receiver, and zero it your POA and POI should not change. Not unless you move those sights say to another upper receiver.
Optics have an ideal height, and they are pretty much set to that height. Then again I've seen men with long necks and men with no necks, so a higher or lower rail might be of some benefit to those. I prefer a higher optic and or iron sight, and it has to due with sight acquisition while at teh high ready. Some may not like that while in the prone.
hope that helped
TS