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I'm pretty sure that issue is due to tolerances between the rail and optic mount. I noticed the same issue with a clone Eotech I have. It fits fine on a King Arms upper but it won't tighten down on a particular G&P upper.
Try shimming the bottom of the mount or the rail itself with some electrical tape (or anything similar), that usually fixes any problems I've had with parts fitting loosely on off-spec rails.
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