Manufaturer Part Number: SOSBDX621The sierra6 family of riflescopes provides the hunter or marksmen with an intelligent auto-holdover specific to their ballistics, target, and environment.This model features sig's bdx ballistic data xchange technology.Adj Size: .25 MOAMagnification: 2-12xObjective: 40mmField Of View: 52.50-8.70 ft @ 100 ydsEye Relief: 3.90"-3.70"Tube Diameter: 40mmWeight: 21.40 ozReticle: Illuminated BDX-R2Parallax Adjustment: 100 ydsProofs: Waterproof