Trijicon ACOG 4x32 Scope w/Dual Illumination Red ACSS Reticle TA31-R-ACSS Fixed Magnification - 4X Dual Illuminated Reticle - ACSS 5.56 Red 5.56 NATO, .308 Winchester, and 5.45x39 7n6 Compatible Second Focal Plane Waterproof / Shock Resistant