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  1. Black Rifle Forum
    Hey all, I recently got a Magpul MBUS Pro LR rear sight for my 20" FN-A4 AR. There is no clear instruction on how to zero the sight, so I set a 50-200m zero with the small aperture using M855 (rear elevation set to 2). When switching to the large aperture, I'm hitting approx 9" high at 100m and...
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