The Sig Sauer SIERRA6BDX 2-12x40mm Riflescope is built upon the SIERRA3 award-winning technology, and the Sig Sauer BDX Ballistic Data Xchange technology. The Sig Sauer SIERRA6 family of riflescopes provides the shooter with an intelligent auto-holdover specific to their ballistics, target, and environment. Pairing a Sig SIERRA6 to a BDX equipped Sig rangefinder allows users to bring the capability of Applied Ballistics into the field without the need for a mobile device. The Sig Sauer SIERRA6BDX 2-12x40mm Riflescope has a BDX-R2 reticle and a digital focal plane. Adjustment increments are 0.25 MOA. Requires 30mm rings to mount to your rifle. Ballistic profiles are compatible with Centerfire, Muzzleloader, and Crossbow Platforms.