The TA31RCO is an Advanced Combat Optical Gun sight (ACOG)

Designed for the M16A4 Weapon system (20” barrel). It incorporates dual illumination technology using a combination of fiber optics and self-luminous tritium. This allows the aiming point to always be 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.

Advanced Combat Optical Gunsight—Hit Fast in any light. Designed for use with the M16 family, every feature of the ACOG mechanical and optical design was chosen for a single purpose: to provide increased hit potential in any light, and under the toughest combat and tactical conditions—without failure-prone batteries.

Rugged, dependable, and battle-proven, Trijicon ACOG systems are internally-adjustable, compact roof prism telescopic sights with battery-free dual illuminated reticles, powered by a patented combination of fiber optic and tritium-based technology. A Trijicon ACOG can measurably increase your ability to make faster “instinctive” shot placements with marksman precision—day or night. Plus, ACOG systems offer Trijicon's exclusive Bindon Aiming Concept™, an innovative both-eyes-open aiming method that uses scope magnification for quicker target acquisition in any light. It provides a huge advantage with fast moving targets, especially during stressful, low-light situations.

Features:

• Bindon Aiming Concept (BAC) allows use of the both-eyes-open aiming method along with scope magnification sighting for rapid target acquisition in any light
• Longer Eye Relief for larger caliber rifles and large exit pupil for fast target acquisition without concern for parallax error—even if you're not positioned perfectly behind the sight
• Internally Adjustable Focus—only the prism housing moves, creating a much more rugged design than conventional telescopic sights
• Trijicon Fiber Optics automatically adjusts the brightness level and contrast of the reticle to available light conditions
• Aiming Reticle glows in low light conditions and is guaranteed to illuminate up to 15 years
• Totally battery-free—ACOG delivers increased hit potential in all lighting conditions without the need for failure-prone batteries
• Broad Band Anti-Reflective Multi-coated Lenses provide superior clarity and light gathering capabilities with zero distortion
• Waterproof to 100 feet / 30 meters
• Dry nitrogen filled to eliminate fogging
• Military-Grade Aluminum Alloy Housing provides for a nearly indestructible sighting system

Includes:

• 1Thumbscrew Flattop Adapter (TA51)
• 1 RCO 4x32 ACOG Pouch (TA86)
• 1 4x32 RCO killFLASH (TA57)
• 1 Adjuster Cap Lanyards
• 1 4x32 Scopecoat (TA64)
• 1 Lenspen (LENSPEN)
• 1 Trijicon Logo Sticker
• 1 RCO Manual
• 1 Warranty Card

Specifications:

• Magnification: 4
• Objective Size: 32
• Bullet Drop Compensator: Yes
• Length: 5.80 in.
• Weight: 9.90 oz.
• Calibration: .223
• Bindon Aiming Concept: Yes
• Eye Relief: 1.5 in.
• Exit Pupil: 8.00 mm
• Field of View (°): 7.00
• Field of View @ 100 yds: 36.80 ft.
• Adjustment Increments: 3 clicks per in. @ 100 yds.