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Posted: 11/30/2008 6:37:29 PM EDT
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Did some searching and came up with one post, but i wanted to confirm that the eotech 511 did not need a mount for an absolute cowitness. true or false? Also will a A2 BUIS sight work properly with an A3 upper? ( i know it should, but questions dont cost $94.00)
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I believe that is true (Eotech will cowitness on it's own) BUT most people like a "lower 3rd" co-witness, meaning the irons are lower in the optic, than being totally in-line with the reticle. Just a matter of less obstruction of the fov by the iron sights.
Absolute cowitness: 
Lower third Cowitness 
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