The Unity Tactical MRDS Top Ring for FAST REKE acts as a non-powered, self-indexing mechanical upgrade that replaces the host mount's original factory top ring cap. Because the underlying FAST REKE Scope Mount features a 1.54-inch primary centerline height rather than Unity's traditional 2.26-inch high-rise profile, this secondary top ring allows you to cleanly bolt a micro red dot directly over your main scope turrets at the 12 o'clock position. By matching it with a specific FAST Optic Adapter Plate, the backup sight is elevated just enough to clear the physical profile of your primary glass, enabling rapid close-quarters target acquisition with a quick shift in your vertical cheek weld.