The Trijicon TA31RCO-M4 ACOG 4x32 USMC M4 Rifle Scope w/ TA51 Mount 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. Trijicon TA31RCO-M4CP ACOG 4x32 Scope with BAC USMC Rifle Optic (RCO) for M4 incorporates dual-illumination technology using a combination of fiber optics and self-luminous tritium. The Trijicon TA31RCO-M4 ACOG 4x32 USMC M4 Tactical Scope includes the Tritium that 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 Corp, the unique reticle pattern on this rifle scope by Trijicon provides the shooter with quick target acquisition at close ranges while providing enhanced target identification. Trijicon ACOG 4 x 32 Rifle Scopes are internally-adjustable, compact telescopic sights with tritium illuminated reticle patterns for use in low light or at night. Trijicon Rifle Scopes combine traditional, precise distance marksmanship with close-in aiming speed that are designed for use with the M16 family. Specifications for Trijicon TA31RCO-M4 ACOG 4x32 USMC M4 Rifle Scope w/ TA51 Mount &: Manufacturer: Trijicon Objective Lens Diameter: 32 mm Magnification: 4 x Reticle: Illuminated Red TA31RCO-M4CP Chevron Exit Pupil: 8 mm Illumination Color: Red Finish: Matte Field of View, Linear: 36.8 ft at 100 yds Field of View, Angle: 7 degrees Eye Relief: 1.5 in Color: Black Weight: 15.1 oz Adjustment Click Value: 1/2 MOA Length: 5.8 in Adjustment Type: MOA Illumination Type: Tritium, Fiber Optics Fabric/Material: Forged Aluminum Shockproof: Yes Fogproof: Yes Package Type: Polymer hard case Included Accessories: TA51 Mount Magnification Type: Fixed Condition: New Country of Origin: USA Attachment/Mount Type: Flattop Features of Trijicon TA31RCO-M4CP ACOG 4x32 Scope with BAC USMC Rifle Optic(RCO) for M4: Military-Grade Aluminum Alloy Housing Forged 7075-T6 aircraft aluminum alloy housing provides for a nearly indestructible sighting system Longer Eye-Relief Maximum eye-relief for larger caliber rifles and large exit pupil for faster target acquisition Internally Adjustable Since only the prism housing moves, the ACOG is much more rugged than the conventional designs Trijicon Fiber Optics Automatically adjusts the brightest level and contrast of the reticle to available light conditions Trijicon Tritium Phosphor Lamp Aiming reticle glows in low-light conditions for quick target acquisition. Lamp is guaranteed to illuminate up to 15 years. Totally Battery-Free ACOG delivers increased hit potential in all lighting conditions - without the use of failure-prone batteries Broad Band Anti-Reflective Coated Lenses Multi-coated lenses provide superior clarity and light gathering capabilities with zero distortion Lifetime Warranty Package Contents: Trijicon TA31RCO-M4 ACOG 4x32 USMC M4 Rifle Scope Trijicon TA51 Mount