The Trijicon ACOG 4x32 BAC Riflescope TA31F is a legendary fixed-power combat optic engineered for rapid target acquisition, long-range precision, and extreme battlefield durability. Designed specifically for .223 / 5.56 NATO platforms, this combat-proven riflescope features Trijicon’s advanced Bullet Drop Compensating (BDC) reticle system calibrated for accurate holdovers out to extended distances.
One of the biggest advantages of the TA31F is its battery-free illumination system. Unlike traditional electronic optics, the ACOG uses a combination of fiber optics for daytime illumination and tritium for low-light illumination, eliminating the need for batteries entirely. The reticle automatically adjusts brightness based on ambient lighting conditions, ensuring a clear and highly visible aiming point in nearly any environment without dependence on electronic power sources.
The optic also incorporates Trijicon’s renowned Bindon Aiming Concept (BAC), allowing shooters to effectively engage targets with both eyes open. This design significantly improves situational awareness, peripheral vision, and target transition speed while still maintaining the precision benefits of magnified optics. The BAC system is especially effective for tactical, defensive, and close-to-mid-range engagements where rapid target acquisition is critical.
Built for extreme durability, the TA31F features a rugged forged aluminum housing designed to withstand heavy recoil, harsh impacts, and demanding combat conditions. The optic is highly shock resistant, tested to endure recoil ranging from lightweight calibers up to larger magnum platforms while maintaining zero and reliable performance under severe use conditions.
The illuminated red chevron reticle is optimized for both fast close-range aiming and precision shooting at extended distances. The chevron tip can be zeroed at 100 meters while the integrated BDC stadia provide holdover references for accurate shots at longer ranges.
The compact fixed 4x optic design minimizes moving parts for enhanced reliability while still delivering exceptional optical clarity, excellent light transmission, and a generous field of view. Nitrogen-filled waterproof construction further protects the optic from fogging, moisture, and environmental exposure in adverse weather conditions.
Trusted by military personnel, law enforcement professionals, and serious shooters worldwide, the Trijicon ACOG TA31F remains one of the most respected fixed-power combat optics ever produced.
FEATURES
Battery-Free Fiber Optic & Tritium Illumination
Bindon Aiming Concept (BAC) for Both Eyes Open Shooting
Red Chevron BDC Reticle
Calibrated for .223 / 5.56 NATO
Combat Proven Fixed 4x Magnification
Shock Resistant Forged Aluminum Housing
Waterproof & Fog Resistant Construction
Bullet Drop Compensating Reticle
Wide Field of View
Outstanding Optical Clarity
Flattop Thumbscrew Mount Included
Compact & Durable Military-Grade Design
No Batteries Required
Nitrogen-Filled Waterproof Housing
IMPORTANT SPECS
Manufacturer: Trijicon
Model: ACOG TA31F
UPC: 719307300095
SKU: TA31F
Type: Fixed Power Riflescope
Magnification: 4x
Objective Lens Diameter: 32mm
Reticle Type: Red Chevron
Reticle Color (Day): Red
Reticle Color (Night): Red
BDC Reticle: Yes
Caliber Compatibility: .223 / 5.56 NATO
Illumination Source: Fiber Optics & Tritium
Battery Required: No
Battery-Free Operation: Yes
Bindon Aiming Concept (BAC): Yes
Both Eyes Open Capability: Yes
Eye Relief: 1.5"
Exit Pupil: 0.32"
Field of View: 36.8 ft @ 100 yds
Field of View (Degrees): 7°
Mount Included: Flattop Thumbscrew Mount (TA51)
Housing Material: Forged Aluminum
Finish: Matte Black
Shock Resistant: Yes
Waterproof: Yes
Fog Resistant: Yes
Nitrogen Filled: Yes
Submersion Depth: 66 ft (-20m)
Dimensions: 5.98" x 2" x 2.3"
Weight: 14.9 oz
Factory Configuration Includes:
Trijicon TA31F ACOG Optic
TA51 Thumbscrew Flattop Mount
4x32 Scopecoat (TA64)
LENSPEN (TA56)
Lanyard Assembly for Adjuster Caps (TA71E)
Trijicon Logo Sticker (PR15)
Owner’s Manual
Warranty Card
