The Primary Arms SLx 3X Micro is a small, light 3x magnifier for use behind a red dot or a compatible 1x prism. It weighs only 150 g, and its small size leaves more rail space than traditional magnifiers. This model has the ACSS Pegasus ranging reticle designed specifically for magnifiers: the red dot handles aiming while the Pegasus scale estimates target distance.
21 mm objective, 7 mm exit pupil and 61 mm eye relief. Field of view is 11.7 m at 100 m. It fits Primary Arms two-bolt magnifier mounts; the mount is sold separately.