-An OEM verison of the Fast Mount with only one third of the original price -2.26”optical centerline height provides faster/easier reticle acquisition -Designed for Aimpoint CompM5s, CompM5b, Duty RDS -Designed to readily accept a drop-in American Defense Manufacturing patented QD Auto-Lock Lever -Built from 7075-T6 Aluminum and Type III Hardcoat Anodized Black -DIMENSIONS: 2.08″(L) x 1.25″(W) x 1.55″(H) Rather than color in Black, I also have color in FDE and OD Green in picture 5 as the same price.