The VX-Freedom is a bestinclass optic that produces a crisp clear image with repeatable accuracy. It features scratch resistant lens 6061T6 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. This model features a calibrated reticle for the .450 Bushmaster cartridge.