ERATAC mounts for Aimpoint Micro, Aimpoint Comp M2/ML2/M3/ML3 and Aimpoint 3X Magnifier are precision CNC machined from high-grade aluminum. The modular system makes it very easy to combine both the Aimpoint Comp and the Micro series sights with the 3X Magnifier. The reddot sight can so be used for medium distances, too. When using on the AR15, the mount with a height of the optical axis A=39 mm allows co-witnessing with the iron sight. For 1/3 lower co-witnessing the mount must be chosen in a height of A=43.5 mm. Both mounts have a 32.5 mm setoff (G=32.5 mm) which positions the reddot sight farther forward in order to provide more room for the 3X Magnifier and a backup-sight. ERATAC Gen 2 Aimpoint Micro 23mm/.906"x10.5mm/.413" Low Red Dot Mount T5120-0010