Sig Sauer Electro-Optics Sierra 6 BDX Black Anodized 5-30x56mm 34mm Tube Illuminated BDX-R2 Reticle The SIERRA6BDX riflescope provides the hunter or marksmen with an intelligent auto-holdover specific to their ballistics, target and environment. Pairing a SIERRA6 to a BDX equipped rangefinder allows users to bring the capability of Applied Ballistics into the field without the need for a mobile device. Featuring Integrated BDX Ballistic Data Xchange 2.0 with up to 95% light transmission; advanced HDX 6x Optical System; ballistic profiles compatible with centerfire, muzzleloader and crossbow platforms; automatic hold-over dot on a Digital Focal Plane; KinETHICTM Kinetic Energy Transfer Indicator for ethical shots and LevelplexTM with auto Levelplex mode.