Athlon Optics 4-20x50 Heras SPR AAGR2 SFP, .1MIL, 1" Tube
4-20x magnification 50mm objective lens 1" aircraft-grade aluminum tube Precision zero stop Locking windage turret High-precision erector system 3.6" eye relief 10 yds to infinity side parallax adjustment 27.9-5.6 feet Field of view at 100 yards 0.1 MIL Click Value 10 MIL adjustment per rotation 21 MIL total elevation adjustment 21 MIL total windage adjustment 13.3" long 25 oz AAGR2 SFP (Second Focal Plane) MIL Etched Glass Reticle Advanced Fully-Multicoated lenses One piece tube Waterproof Fogproof Shockproof Argon purged Lifetime warranty