Trijicon ACOG 4x32 Scope with Chevron BAC Flattop Reticle TA31F includes Trijicon TA51 Flat Top Adapter. The chevron reticle of the Trijicon Gun Sight is designed to be zeroed using the tip at 100 meters. The width of the chevron at the base is 5.53 MOA which is 19" at 300 meters. This allows range estimation for silhouette targets. Trijicon TA31F ACOG 4x32 Scope with Chevron BAC Flattop Reticle features Dual Illumination (Fiber Optic provides daylight illumination and tritium illuminates reticle at night). The ranging reticle is calibrated for 5.56mm (.223 cal) flat-top rifles out to 800 meters. Trijicon TA-31F 4 x 32mm ACOG Advanced Combat Optical Gunsights hit fast in any light. 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. Bind on Aiming Concept (BAC) models feature bright daytime reticles using fiber optics which collect ambient light. Trijicon 4x32 ACOGs combine traditional, precise distance marksmanship with close-in aiming speed. Although Trijicon ACOG 4 x 32 Rifle Scopes TA31-F have many features which are very advantageous for military use, they were developed by Trijicon without government funding. Designed for use with the M16 family, every feature of its mechanical and optical design was chosen for a single purpose: to provide increased hit potential in all lighting conditions - without failure-prone batteries. Specifications for Trijicon ACOG 4x32 Scope KIT, Green Chevron BAC Flattop Reticle & TA51 Mount: Manufacturer: Trijicon Objective Lens Diameter: 32 mm Magnification: 4 x Reticle: Illuminated Green Chevron BAC Reticle Focal Plane: Second Focal Plane (SFP) Exit Pupil: 8 mm Illumination Color: Green 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: 9.9 oz Adjustment Click Value: 1/2 MOA Length: 5.8 in Adjustment Type: MOA Illumination Type: Fiber Optics, Tritium Fabric/Material: Forged Aluminum Lens Material: Glass Optical Coating: Multi-Coated Battery Life: no batteries Water Resistance Level: Waterproof Water Resistant Mark: 328 ft Shockproof: Yes Fogproof: Yes Package Type: Polymer hard case Included Accessories: 4x32 Scopecoat TA64, Flattop Mount TA51, Lanyard Assembly for Adjuster Caps TA71E, Warranty Card, ACOG Manual, Trijicon Logo Sticker PR15, LENSPEN TA56 Magnification Type: Fixed Condition: New Country of Origin: USA Front Sight Color: Green Attachment Type: TA51 Features of Trijicon TA31 ACOG 4x32mm Rifle Scopes with Chevron BAC Flattop Reticle: Military-Grade Aluminum Alloy Housing Forged 7075-T6 aircraft aluminum alloy housing provides for a nearly indestructible sighting system Binding Aiming Concept (BAC) Trijicon ACOG models equipped with BAC allow use of the both-eyes-open aiming method along with scope magnification sighting for rapid target acquisition - in any light 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 TA31F ACOG Gun Scope w/ Chevron BAC Flattop Reticle Trijicon TA51 Flattop Mount 4x32 scopecoat Lenspen Trijicon logo sticker ACOG manual Warranty Lanyard assembly for adjuster caps