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Machined aluminum riser clamps to flattop AR-15 receiver to position primary optic sights at eye level. Raises mounting height .750" to eliminate the need for extra-high rings in most applications. True, MIL-STD 1913 Picatinny cut accepts both Picatinny and Weaver-style rings. Two, easy-to-grip, slotted hex nuts accept a U.S. quarter for extra tightening leverage; full-length clamping bar locks riser securely to flattop receiver for zero movement even during harsh tactical operations. Precision CNC machined to ensure an exceptionally secure lock on the receiver rail. Smooth, curved front and rear contours on the underside provide a streamlined appearance, reduce weight, and minimize the chance of catching on gear.