The Trijicon 4x32 ACOG TA31-D-100553 ECOS configuration is the complete dual sighting system for serious rifle users who need precise magnified aiming capability at distance and fast close-quarters target acquisition in a single integrated package - the proven 4x32 ACOG with RMR combo that gives the shooter the best of both aiming solutions without carrying two separate optic systems. The 4x32 ACOG TA31-D-100553 delivers precise 4x magnification and a red crosshair reticle calibrated for 5.56, making the ACOG the standard magnified combat optic for military and law enforcement professionals worldwide. The dual-illuminated system uses fiber optics and tritium to keep the red crosshair reticle lit without batteries in any lighting condition, a battery-free illumination that field operators have trusted for decades of hard operational use. The ACOG scope TA31-D-100553 RMR mounted on top of the ACOG gives the shooter fast, both-eyes-open close-quarters target acquisition using the ACOG mount integrated RMR sight when the distance closes, and the 4x magnification becomes a liability rather than an advantage. The Bindon Aiming Concept allows natural both-eyes-open aiming through the RMR for instinctive close-range engagement without any transition delay. The Trijicon ACOG TA31-D-100553 ECOS configuration includes integrated iron sights as a backup aiming solution when the primary optics are not optimal for the situation. The quick-release mount allows fast, reliable attachment and removal from Picatinny rail-equipped platforms without tools. The ACOG sight TA31-D-100553 features rugged construction that handles hard operational use in any environment and condition. Trijicon ACOG/RMR Features And Options These encompass the options of this product line. Check the product specifications to be sure you have the scope combo with the desired features. Magnification - 3x - 6x Size - 32mm - 48mm Weight, 7.7 oz - 39.3 oz Fiber Optics and Tritium Illumination Source Reticle Pattern - Crosshair, Chevron Day Reticle Color - Red, Green, Black, or Amber Night Reticle Color - Red, Green, Black, or Amber Housing Material - Forged Aluminum Mount Options - TA75, TA51, Quick Release Calibration - .50 BMG, .223 Long-range shooting for the military has been made easier thanks to the Trijicon ACOG/RMR Combos. ACOG/RMR combos provide the up-close target acquisition for close quarters/CQB in addition to long-range targets. This dual-sighting system gives the shooter a distinct tactical advantage with the option of either the Trijicon ACOG or the RMR Sight. With the quick target acquisition of the RMR Sight or the precise aiming capabilities provided by the magnified Trijicon ACOG, the shooter has the ability to select the proper aiming solution for the situation at hand - truly the best of both worlds. Powered by Trijicon’s patented fiber optics and tritium-based technology, Trijicon ACOG/RMR scopes can feature a multiple reticles and configurations. To further improve target acquisition and hit potential, Trijicon ACOG/RMR scopes incorporate Trijicon’s Bindon Aiming Concept – which allows for both eyes open for aiming. A Trijicon RMR sits on top, and can feature several different sizes of aiming dot. Trijicon ACOG/RMR Features And Options These encompass the options of this product line, check the product specifications to be sure you have the scope combo with desired features. Magnification - 3x - 6x Size - 32mm - 48mm Weight, 7.7 oz - 39.3 oz Fiber Optics and Tritium Illumination Source Reticle Pattern - Crosshair, Chevron Day Reticle Color - Red, Green, Black, or Amber Night Reticle Color - Red, Green, Black, or Amber Housing Material - Forged Aluminum Mount Options - TA75, TA51, Quick Release Calibration - .50 BMG, .223 Trijicon 4x32 ACOG ECOS Dual Illum Red Crosshair 5.56 Reticle w/Iron Sights QR Mount - LED 3.25 MOA Red RMR Type 2 - FDE TA31-D-100553