The VX-Freedom is a best-in-class optic that produces a crisp, clear image with repeatable accuracy. It features scratch resistant lens, 6061-T6 aircraft aluminum waterproof and fogproof 1" tube, and a twilight light management system.The Custom Dial System (CDS) model features a custom dial that eliminates the need for holdovers. Simply range your target, dial the distance, and aim dead on.