Athlon Optics 2-12x42 Argos HMR BDC 600A SFP MOA, 1" Tube 2-12x magnification 42mm objective lens 1" tube diameter Capped turrets 3.6" eye relief 10 yds to infinity side parallax adjustment 55.7-9.6 feet field of view at 100 yards 0.25 MOA click value 15 MOA adjustment range per rotation 80 MOA total elevation and windage adjustment 11.8" long 19.8 oz BDC 600A SFP (Second Focal Plane) MOA Etched Glass Reticle Illuminated reticle with variable brightness Advanced Fully-Multicoated lenses Aircraft grade aluminum One piece tube Waterproof Fogproof Shockproof Argon purged Lifetime warranty