The Sightron S-TAC3-16X42FFPZSIRMH-2 features 3-16X magnification with an objective diameter of 42mm and tube diameter of 30mm. Includes a pop-up zoom ring lever for ease of use in cold environments. The tactical-style turrets offer .1 MRAD adjustments at 100 meters and are resettable to zero. This scope features Sightron?s unique ExacTrack windage and elevation adjustment system, applying a proper alignment between the adjustments and the erector tube. Side focus parallax allows easy adjustment and focus from minimum distance to infinity. The Zact-7 Revcoat multi-coating provides maximum optical quality and light transmission. This scope is waterproof, shockproof, and nitrogen gas charged.Features:Zero-stop model;Fast focus eyebell;Mil-Hash-2 (IR) reticle - First focal plane;.1 MRAD clicks at 100 meters;4.1 - 3.6 in. of eye relief