We have a long history of manufacturing rugged and reliable riflescopes that outperform and outlast everything else on the battlefield and in competition. We used that heritage to create an extremely versatile line of tactical scopes. The Mark 3HD 1.5-4x20mm provides a wide field of view, while also allowing for precise, close to mid-range shots.Complete with MIL-based adjustments and reticles, HD performance, an exposed elevation adjustment dial, and a low-profile power selector with integrated throw lever, the Mark 3HD series is perfect for anyone who needs a rugged, precise, and repeatable scope. Built around Leupold's Elite Optical System, it offers the light transmission, glare reduction, and resolution that diehard hunters and shooters demand for all-day performance. And like every Leupold riflescope, the Mark 3HD was designed, machined, and assembled in our Oregon factory. We test it to ensure it's absolutely rugged, 100% waterproof and fogproof, and then we guarantee it for a lifetime of performance. Features 3:1 Zoom Ratio A 3:1 zoom ratio is very common in many scope models. It gives you 3 times more magnification at high power than at low power, so you can dial your power down for close encounters or all of the way up for long-range shots. High Definition High-definition, calcium-fluoride lenses ensure incredible clarity at all magnification levels. Zero Stop The ZeroStop system creates a backstop when returning the dial back to zero, so you don't accidently turn the dial a full revolution in the wrong direction. Custom Dial Compatible Leupold's Custom Dial System (CDS) gives you the ability to customize your turret (adjustment dial) to your exact ballistics and environmental conditions. Once your new custom dial is installed, simply range the target, turn the dial to that number, and aim dead on. Waterproof, Fogproof, & Shockproof Leupold pioneered modern waterproof and fogproof technology using advanced internal gasses and sealing methods that withstand extreme temperatures, elevation changes, and shocks, so the internals of the optics stay moisture free and crystal clear for life. AR-Ballistic Specifically designed for .223 AR-style rifles Based on a Duplex style design Provides holdover hash marks for quick target engagement Uses a 200 yard zero with aiming points out to 600 yards Rear (second) focal plane Subtension And Magnification The AR Ballistic reticle will measure (subtend) correctly when the riflescope is set to the highest available magnification. The reticle's apparent size in the field of view may vary between models of riflescope.