First Focal Plane reticle is true at every magnification; Illuminated ACSS Apollo .308/6.5 Grendel reticle; 3-18x Magnification with 50mm objective lens; Provides better clarity and larger eye box; 30mm tube diameter; Improved turrets with more adjustment range and accurate tracking; Tactile and audible clicks; 6 Illumination settings; Waterproof, fog resistant, shock resistant