The Trijicon ACOG 3.5x35mm is a compact, internally adjustable combat riflescope built around Trijicon’s Bindon Aiming Concept (BAC), which lets shooters keep both eyes open for fast, instinctive target acquisition (model 100136). It features a dual-illuminated reticle that combines fiber optics for daylight brightness with tritium for illumination at night, so it never needs a battery, with a red donut aiming point, calibrated for .223/5.56 NATO.

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Key Specifications

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• Delivers 3.5x fixed magnification through a 35mm objective lens.

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• Features an illuminated Red Donut reticle for a fast, repeatable aiming point.

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• Reticle is calibrated for .223/5.56 NATO ballistics.

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• Uses Trijicon’s battery-free dual-illumination (fiber optic by day, tritium at night).

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• Built around Trijicon’s Bindon Aiming Concept (BAC) for both-eyes-open shooting.

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• Provides 2.40 in. of eye relief.

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• Adjusts in 3 Clicks per Inch @ 100 yds increments for windage and elevation.

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• Lenses are multi-coated for improved light transmission.

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• Measures 8 in. in overall length.

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• Manufactured by Trijicon.

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Frequently Asked Questions

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Does this Trijicon ACOG need a battery? No. This ACOG uses Trijicon’s dual-illumination system, fiber optics by day and tritium at night, so there is no battery to replace.

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What caliber is the reticle calibrated for? The reticle is calibrated for .223/5.56 NATO, matching typical ammunition drop out to several hundred yards.

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What magnification and objective size does this ACOG have? This model is a fixed 3.5x magnification with a 35mm objective lens.

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Buy the Trijicon ACOG 3.5x35mm Red Donut (.223) Riflescope

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Get precise, both-eyes-open aiming with this Trijicon optic, or browse our full gun scopes selection.