If you are running the front flip up with the rear diopter successfully, it is likely you have the 28mm front sight that won't work with the folding rear. The folding rear sight needs the 33mm folding front sight to work correctly.
Flip up sights on MR556
Anyone running the front flip up sight with the rear diopter sight? I have a front flip up, but do not have the flip up rear sight, just wondering if I should purchase it or keep the rear diopter.
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