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 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