Trijicon ACOG RCO Riflescope

The RCO (Rifle Combat Optic) is specifically engineered to meet USMC specifications for M4 and M4A1 weapon systems. It features a reticle calibrated for the ballistics of a 14.5-inch barrel firing 5.56 NATO ammunition, ensuring the Bullet Drop Compensator is accurate for that specific setup.

No, the ACOG RCO uses a dual-illumination system combining fiber optics and tritium. The fiber optics gather ambient light during the day, while the tritium provides a self-sustaining glow in low-light conditions, meaning you never need to worry about battery life.

The BAC allows you to keep both eyes open while shooting. Because of the 4x magnification, your brain naturally superimposes the illuminated reticle from the scope onto your target view, allowing for rapid target acquisition at close range while maintaining the precision of a magnified optic.

Yes, the housing includes integrated mounting bosses specifically designed to accept a Trijicon RMR sight. This setup is ideal if you want a dedicated close-quarters optic alongside the 4x magnification of the ACOG.

The eye relief is 1.5 inches, which is standard for this specific ACOG model but relatively short compared to modern variable-power scopes. You will need to maintain a consistent cheek weld to ensure you are within the eye box for a full field of view.

No, the RCO features external adjusters that allow for tool-free windage and elevation changes. This makes it easy to make field adjustments without needing to carry extra equipment.