The SAI 6 1-6x24mm Riflescope was built with ruggedness and versatility at the core of its design. The SAI 6 comes packed with features that other scopes of this class fail to include, notably the Rapid Aiming Feature. This proprietary reticle option is a large open “X” which is excellent for quickly acquiring and engaging targets at close range. The reticle also has a free-floating center cross with hash marks directly below to compensate for elevation as well as windage compensation holdover dots in the “Christmas tree” setup. The SAI 6 also has a VSOR rangefinder in the lower left-hand corner of the reticle, this feature allows the shooter to accurately estimate the range of objects with a known height. In addition, the reticle is in the first focal plane so the reticle shrinks and grows as you zoom in or out with your target for greater flexibility at any range. Features of the SAI 1-6x24mm Riflescope: Proprietary Rapid Aiming FeatureVSOR rangefinder First focal plane reticle (Calibrated for 6.8x51mm Ammunition - M855) Illuminated, 10 settings 5 year, limited lifetime warrantySIA 6 Overview SAI Optics SAI 6 1-6x24mm .1 MRAD FFP 6.8 BDC Rapid Aiming Feature Riflescope RNG16-T170-C30