BARSKA 1.5-4.5x20, Tactical Mil-Dot Riflescope Tactical scopes performance features like side adjustable parallax knobs and first focal plane mil-dot reticle that allows you to estimate range at all power settings Proprietary Accu-Lock system utilizes coil spring positioned within scope to securely affix inner tube, allowing scope to stay locked dead-on to target, after repeated shots and intense recoil 1.5-to-4.5X magnification, one-inch tube diameter, 20-millimeter objective lens, 11.9-to-4.4-millimeter exit pupil, 10.3-inch length, and 12.6-ounce weight Water-, shock-, and fog-proof; side adjustment, target-style knob for windage and elevation; includes scope caps, mounting rings, and lens cloth Includes limited lifetime manufacturer's warranty