The Unity Tactical FAST Micro-SB is specifically designed for the Aimpoint CompM5s, CompM5b and Duty RDS mini red dot sights and features a built-in, fully adjustable front and rear back-up iron sight. It puts these taller “micro” sights at a height of 2.26″ and is fully compatible with the entire line of FAST FTC magnifier mounts. It comes standard with a 2 cross bolt rail clamp, but is compatible with the FAST QD Lever (sold separately).