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The REX Riser is a low-profile, lightweight riser for AR platforms.
Set at the ideal height for co-witnessing while using the Strike Reflex Exoskeleton (REX) mount with either A2 height (using included space), or Strike Sidewinder sights (used without spacer).
While optimized for use with the REX Mount, the universal Picatinny pattern can be used with many other optics that can be mounted on Picatinny sections. (Amount of co-witness will vary.)