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 3x24 ACOG features a low height body design allowing for the lowest possible mounting configuration. This achieves the desirable height above bore for the AK and other select firearm models with lower cheek welds. Mounting bosses are integrated into the housing for easy addition of your Trijicon RMR (not included). It includes adjuster caps with a lanyard assembly to minimize the loss of caps.This model has a dual illuminated green crosshair 223/55GR ballistic reticle. Note: This optic requires a mounting adapter (sold separately).