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This Nc Star MARFLF Ar15 Flip Up Front Sight will fit virtually all AR-15, M4, and M16 flattop Picatinny rail upper receivers. The Nc star Flip Up Front Sight is fully adjustable for elevation and windage by adjustable controls. In addition, is it small enough, youll be able to not only mount a red dot sight but HOLO sights as well.