The Trijicon ACOG ECOS is the ultimate sight for both Close Quarter Battle (CQB) situations and longer distance shooting where accuracy and pinpoint bullet placement are required. This dual-sighting system gives the shooter a distinct tactical advantage with the option of either the Trijicon ACOG or the RMR Type 2 Sight. With the quick target acquisition of the RMR Type 2 Sight or the precise aiming capabilities provided by the magnified 4x Trijicon ACOG—the shooter has the ability to select the proper aiming solution for the situation at hand—truly the best of both worlds. No tools are needed for windage and elevation adjustments because the ECOS also features external windage and elevation adjusters making it waterproof up to 11m without caps. – The TA31-D-100554 also includes: – 1 3.25 MOA RMR® Type 2 LED Red Dot mounted to ACOG – 1 Trijicon® Quick Release Mount (AC12033) – 1 LENSPEN® (TA56) – 1 Lanyard Assembly for Adjuster Caps (TA71E) – 1 Trijicon Logo Sticker (PR15) – 1 ACOG Manual – Magnification: 4x – Objective Size (mm): 32 – Bullet Drop Compensator: Yes – Length (in): 6.2 – Weight (oz): 15 – Illumination Source: Fiber Optics & Tritium – Reticle Pattern: Crosshair – Day Reticle Color: Green – Night Reticle Color: Green – Calibration: 0.223 – Bindon Aiming Concept: Yes – Eye Relief (in): 1.5 – Exit Pupil (mm): 8 – Field of View (Degrees): 7 – Field of View @ 100 yards (ft): 36.8 – Adjustment @ 100 yards (clicks/in): 2 – Mount: Quick Release – Mount Comes With: Quick Release – Housing Material: Forged Aluminum