The Unity Tactical FAST MRDS mount, in conjunction with the Optic Adapter Plates in the FAST Modular Accessory Suite, brings compatible micro red dot sights to the established FAST height of 2.26" to optical centerline.This includes micro red dot sights with any of the following footprints: RMR, DeltaPoint Pro, ACRO, 509T, RMSc and Holosun K. It comes standard with a two cross bolt rail clamp, but is compatible with the FAST QD Lever. With exception to the Leupold DeltaPoint Pro, it is also compatible for use with the line of FAST FTC magnifier mounts. Features2.26" Height to Optical CenterlineCompatible with Unity Tactical FAST Modular Adapter Plates