These AR15 Rifle Scopes are tailored to MSRs, providing quick engagement and target acquisition with their BDC6 illuminated reticle and removable thread-in throw lever for fast magnification changes. They have 0.5 MOA adjustment increments and a 44 MOA travel-per-rotation. At 100 yards the FOV (Field of View) is 124.8 on low power and 19.6 on high power. The diopter adjustment range is +/- 2.5, with 11 illumination settings. SIG SAUER brings industry-leading light transmission and optical clarity for any situation. Long known for their handguns and rifles, as soon as they moved into the optics industry they dominated.