Trijicon ACOG 4x32 Rifle Combat Optic (RCO)

The Trijicon ACOG (Advanced Combat Optical Gunsight) 4x32 Rifle Combat Optic is the fixed-power rifle scope trusted by the U.S. Marine Corps and issued on the M4 and M4A1 platform. It's the single most recognizable combat optic in the world, built for one job: fast, reliable target acquisition in any condition, with no batteries required.

The ACOG's dual-illumination system combines fiber optics and self-luminous tritium so the red chevron reticle is always visible, brightening automatically in daylight and glowing in total darkness without a power switch or battery to fail. The reticle's Bullet Drop Compensator (BDC) is calibrated for 5.56/.223 out of a 14.5" barrel, giving Bindon Aiming Concept (BAC) shooters both-eyes-open target engagement out to 800 meters.

Housed in a forged aluminum body and nitrogen-purged to prevent fogging, the ACOG is rated waterproof to 66 feet and built to pass U.S. military drop-test standards. It mounts to any flattop MIL-STD rail using the included TA51 thumbscrew mount, with no tools required for windage or elevation adjustment.

• Magnification: 4x | Objective: 32mm
• Reticle: Red Chevron, Bullet Drop Compensating (BDC) for 5.56/.223 (14.5" barrel)
• Illumination: Fiber Optics & Tritium (battery-free, always on)
• Eye Relief: 1.5 in. | Field of View: 7° (36.8 ft. @ 100 yds.)
• Weight: 14.9 oz. | Waterproof to -66 ft.
• Mount: TA51 Flattop Thumbscrew Mount (included)