The Sig Sauer SIERRA6BDX 5-30x56mm Riflescope has a 5-30x magnification range and comes with a digital focal plane. It uses 34mm rings to mount to your rifle. Built upon SIERRA3 award-winning technology, and the SIG SAUER BDX Ballistic Data Xchange technology, the SIERRA6 family of riflescopes provides the marksman 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. It is argon purged to offer an enhanced lifetime of shooting performance.