The TRIJICON ACOG 4x32 Scope, USMC Rifle Combat Optic for the M4, TA51 Mount (TA31RCO-M4CP) is an Advanced Combat Optical Gun sight (ACOG) designed for the M16A4 Weapon system (14.5" barrel). It provides the shooter with quick target acquisition at close combat ranges while providing enhanced target identification and hit probability out to 800 meters utilizing the Bullet Drop Compensator.
The TA31RCO incorporates dual-illumination technology using a combination of fiber optics and self-luminous tritium. This allows the aiming point to be always illuminated without the use of batteries.
The Tritium illuminates the aiming point in total darkness, and the fiber optic self adjusts reticle brightness during daylight according to ambient light conditions. This allows the operator to keep both eyes open while engaging targets and maintaining maximum situational awareness.
Designed to the exact specifications of the United States Marine Corps, the unique reticle pattern provides quick target acquisition at close combat ranges while providing enhanced target identification and hit probability out to 800 meters utilizing the Bullet Drop Compensator.
The Trijicon ACOG 4x32 Scope incorporates the innovative Bindon Aiming Concept (BAC). This revolutionary, both-eyes-open aiming method provides you with "instinctive" target acquisition and increased hit potential. And, the scope's ranging is built into many of its reticles, so you only need to set zero once for a multitude of ranging distances.
Broad-band, anti-reflective coated lenses provide superior clarity and light gathering capabilities with zero distortion. The ACOG also offers large Eye Volume, giving you greater leeway - fore and aft, and from side to side - with which to see through the lens. Of course, once the target is acquired, the ACOG is a trusted ally to help you zero in on a perfect shot.
The ACOG is crafted with a tough, military-grade, aluminum-alloy housing and is waterproof to depths of 100 feet - making it nearly indestructible. Only the prism housing moves, so it's much more rugged than conventional designs.
Objective Size, mm
Eye Relief, mm
Exit Pupil, mm
Field of View, degree
Field of View @ 100 yards, ft
Adjustment @ 100 yds (clicks/in)
Dual Illuminated Red Chevron w/ Target Reference System
Day Reticle Color
Night Reticle Color
ACOG delivers increased hit potential in all lighting conditions - without the use of failure-prone batteries
Trijicon fiber optics automatically adjust the brightness level and contrast of the Trijicon reticle to available light conditions
Trijicon tritium-phosphor lamp aiming reticle glows in lowlight conditions for quick target acquisition. Lamp is guaranteed to illuminate up to 15 years
Internally adjustable since only the prism housing moves, the Trijicon ACOG is much more rugged than conventional designs
Large eye volume allows you to quickly acquire targets, even if you're not positioned perfectly behind the scope
Manual brightness override easily adjust the Trijicon aiming point brightness to your personal preference
Adjuster cap retention lanyard wires crimped to caps to secure to unit
Military-grade aluminum-alloy housing provides for a nearly indestructible sighting system
Waterproof to 100 feet/30 meters. Dry-nitrogen filled to eliminate fogging
USMC Rifle Combat Optic for the M4
Dual Illuminated Red Chevron .223 Ballistic Reticle w/ Target Reference System
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