The Huskemaw Optics 5-20 Long Range Scope is the most advanced Ballistic Compensating rifle scope available. With technical advancements like True BC, the Rapid Field Ballistic Compensator and our simple yet powerful Hunt Smart range finding and windage compensating reticle. The 30mm main tube, 50mm objective lens, and side focus parallax correction dial make the 5-20 LR scope an outstanding choice for both varmint hunters and target shooters, but it also includes special features for the big game hunter. Ballistic compensation and parallax adjustments are easily made without breaking shooting position, and the 50mm objective lens creates a bright, clear image for high magnification and low light use.