While the 17-Bravo retains the the popular 3.2-17x magnification range todays professionals are asking for, the similarities stop there. These new optics now have locking elevation and windage knobs, zero stop, revolution counter, tool-less elevation zero and a single button illumination control which has been integrated into the parallax adjustment knob. All this and still the same durability, reliability and performance that US Optic's scopes are known for. Parallax Adjustment: 50yds to US Optics B-17 3.2-17x50 HORUS H102 .1 mrad B-17 H102