NcSTAR NC Star RB24QR, 30mm Rings, Wide QR Ring/1.5" Centerline Height Heavy duty 30mm scope ring with adjustable locking quick release mount. Mounts onto Weaver/Picatinny/MIL-STD 1913 type rails Works with 30mm scope and Reflex optics Mount height is at the AR15 height for co-witnessing with your iron sights