The Mark 4HD 6-24x52mm is Leupold's working answer to the precision market: first focal plane, 34mm tube, and the illuminated PR2-MOA reticle for shooters who think in minutes rather than mils. Subtensions hold true across the whole magnification range, and side focus parallax adjustment keeps the image honest from 100 yards to way out there.The M1C3 elevation dial has a zero lock that keeps it from wandering in a pack or scabbard. Leupold's optical system holds up at the low light edges of legal shooting hours, which is where hunting scopes earn or lose their keep. This is the configuration for MOA shooters building one precision rig to cover matches, steel weekends, and a fall rifle season.