Sig Sauer TANGO SPR, Rifle Scope, 1-4X Magnification, Second Focal Plane, Hellfire Quadplex Illuminated FL-4 Reticle, 24mm Objective, 30mm Main Tube, Black, Includes ALPHA MSR 1.535 Mount SOTS41000 These TANGO-SPR models bring advanced features and performance never before available at these price points.