The FAST™ Micro-S is specifically designed for the Aimpoint® CompM5s, CompM5b and Duty RDS mini red dot sights. It puts these taller “micro” sights at the established FAST™ height of 2.26" and is fully compatible with the entire line of FAST™ FTC (Flip-to-Center) magnifier mounts. It comes standard with a 2 cross bolt rail clamp, but is compatible with the FAST™ QD (Quick Detach) Lever.