Trijicon's ACOG (Advanced Combat Optical Gunsight) is a fixed power, compact riflescope with an illuminated reticle pattern for use in bright to low/no light with legendary durability and reliability. Every feature of its design was chosen for a single purpose, to provide increased hit potential in all lighting conditions. Fewer moving parts than a variable optic equals more durability, and the forged 7075-T6 aircraft-aluminum-alloy housing provides for a nearly indestructible sighting system. Multi-coated lenses provide superior clarity and light-gathering capabilities with zero distortion. The ACOG is dry-nitrogen-filled to eliminate fogging and waterproof to 100 meters. It is shock-resistant, proven to withstand recoil from 22LR up to 50 BMG, and easily passes U.S. military drop test requirements. This ACOG features a dual illuminated green crosshair 223 ballistic reticle calibrated to 800 meters. It also includes a TA51 mount. This model includes Trijicon's 3.25 MOA RMR type two LED red dot and has a Tritium dual illuminated red crosshair reticle. Adapted from the battlefields, US forces have begun improving this proven Trijicon ACOG scope by adding a small red dot sight on top for close encounter missions. Trijicon has now created a similar model for the public, the TA31-C-100552. The main Trijicon scope provides a dual-illuminated reticle using fiber optics and tritium for bright aiming point in any light condition. The ranging reticle allows for bullet drop compensation out to 800 m without any manual adjustments. A Trijicon RMR Type 2 sits on top with a 3.25 MOA aiming dot. Features: Fiber optics and tritium power and illumination source Bullet drop compensating Bindon aiming concept